Salam
@RAYYAN and I were having a discussion on this, and I thought it's good idea to make a thread, lest it get's lost in that huge thread.
Nabi word emphasizes on reception. It means receiving a divine book from God channeling it to the people.
Rasool word emphasizes on conveying the message. It means the message of God's religion and God's message has to be conveyed to the people.
Now if we say God's message is God's own words and hence Quran. This equates the role of Nubuwa with Resalah.
وَمَا أَرْسَلْنَا مِنْ قَبْلِكَ مِنْ رَسُولٍ وَلَا نَبِيٍّ إِلَّا إِذَا تَمَنَّىٰ أَلْقَى الشَّيْطَانُ فِي أُمْنِيَّتِهِ فَيَنْسَخُ اللَّهُ مَا يُلْقِي الشَّيْطَانُ ثُمَّ يُحْكِمُ اللَّهُ آيَاتِهِ ۗ وَاللَّهُ عَلِيمٌ حَكِيمٌ | We did not send any Messenger nor a Nabi before you but that when he wished Satan cast in his wish Thereat Allah nullifies whatever Satan has cast, and then Allah confirms His signs, and Allah is All-knowing, All-wise. | Al-Hajj : 52
One thing to note, both a Nabi and Rasool are Mursal (sent by God). The word Mursal is more inclusive.
According to the above verse, not every Nabi is a Rasool.
In Surah Baqara, we read about Anbiya:
كَانَ النَّاسُ أُمَّةً وَاحِدَةً فَبَعَثَ اللَّهُ النَّبِيِّينَ مُبَشِّرِينَ وَمُنْذِرِينَ وَأَنْزَلَ مَعَهُمُ الْكِتَابَ بِالْحَقِّ لِيَحْكُمَ بَيْنَ النَّاسِ فِيمَا اخْتَلَفُوا فِيهِ ۚ وَمَا اخْتَلَفَ فِيهِ إِلَّا الَّذِينَ أُوتُوهُ مِنْ بَعْدِ مَا جَاءَتْهُمُ الْبَيِّنَاتُ بَغْيًا بَيْنَهُمْ ۖ فَهَدَى اللَّهُ الَّذِينَ آمَنُوا لِمَا اخْتَلَفُوا فِيهِ مِنَ الْحَقِّ بِإِذْنِهِ ۗ وَاللَّهُ يَهْدِي مَنْ يَشَاءُ إِلَىٰ صِرَاطٍ مُسْتَقِيمٍ | Mankind were a single community; then Allah sent the prophets as bearers of good news and warners, and He sent down with them the Book with the truth, that it may judge between the people concerning that about which they differed, and none differed in it except those who had been given it, after the manifest proofs had come to them, out of envy among themselves. Then Allah guided those who had faith to the truth of what they differed in, by His will, and Allah guides whomever He wishes to a straight path. | Al-Baqara : 213
The Anbiya have the book revealed/sent with them. This is part of their definition.
However, we read about Messengers, then some God talked to but not all.
تِلْكَ الرُّسُلُ فَضَّلْنَا بَعْضَهُمْ عَلَىٰ بَعْضٍ ۘ مِنْهُمْ مَنْ كَلَّمَ اللَّهُ ۖ وَرَفَعَ بَعْضَهُمْ دَرَجَاتٍ ۚ وَآتَيْنَا عِيسَى ابْنَ مَرْيَمَ الْبَيِّنَاتِ وَأَيَّدْنَاهُ بِرُوحِ الْقُدُسِ ۗ وَلَوْ شَاءَ اللَّهُ مَا اقْتَتَلَ الَّذِينَ مِنْ بَعْدِهِمْ مِنْ بَعْدِ مَا جَاءَتْهُمُ الْبَيِّنَاتُ وَلَٰكِنِ اخْتَلَفُوا فَمِنْهُمْ مَنْ آمَنَ وَمِنْهُمْ مَنْ كَفَرَ ۚ وَلَوْ شَاءَ اللَّهُ مَا اقْتَتَلُوا وَلَٰكِنَّ اللَّهَ يَفْعَلُ مَا يُرِيدُ | These are the Messenger, some of whom We gave an advantage over others: of them are those to whom Allah spoke and some of them He raised in rank, and We gave Jesus, son of Mary, manifest proofs and strengthened him with the Holy Spirit. Had Allah wished, those who succeeded them would not have fought one another after the manifest proofs had come to them. But they differed. So there were among them those who had faith and there were among them those who were faithless, and had Allah wished, they would not have fought one another; but Allah does whatever He desires. | Al-Baqara : 253
Now something to note, God talks to Musa's (a) mother (a) but this does not make her a Nabi or Rasool. God talks to every Messenger and Nabi just as he talked to Musa's (a) mother, this is not the issue, but here it means God's words to humanity.
What is meant by Talk to here is God's words to humanity in a form of a book. Not every Rasool hence is a Nabi.
So we see not every Nabi is a Rasool and not every Rasool is a Nabi. But how Quran uses them interchangeable in many places, we can concluded almost all Anbiya were Rusul and almost all Rusul were Anbiya.
This is because Nubuwa and Resalah compliment each other and even we can say intersect in roles often.
And these are not the only two roles of Mursaleen. Mursaleen (sent ones) are sent as witnesses, lanterns giving light, leaders, kings, authorities, guides as well.
The Quran didn't end all the roles of sent ones, but rather the following verse shows God continuously sends:
أَمْرًا مِنْ عِنْدِنَا ۚ إِنَّا كُنَّا مُرْسِلِينَ | as an ordinance from Us for We were/are/will be ever sending | Ad-Dukhaan : 5
The type of Arabic tense is hard to describe but it means WAS sending in the past, IS sending NOW, and WILL be sending in the future all at the same time. It means there is no time when God is not sending.
@RAYYAN and I were having a discussion on this, and I thought it's good idea to make a thread, lest it get's lost in that huge thread.
Nabi word emphasizes on reception. It means receiving a divine book from God channeling it to the people.
Rasool word emphasizes on conveying the message. It means the message of God's religion and God's message has to be conveyed to the people.
Now if we say God's message is God's own words and hence Quran. This equates the role of Nubuwa with Resalah.
وَمَا أَرْسَلْنَا مِنْ قَبْلِكَ مِنْ رَسُولٍ وَلَا نَبِيٍّ إِلَّا إِذَا تَمَنَّىٰ أَلْقَى الشَّيْطَانُ فِي أُمْنِيَّتِهِ فَيَنْسَخُ اللَّهُ مَا يُلْقِي الشَّيْطَانُ ثُمَّ يُحْكِمُ اللَّهُ آيَاتِهِ ۗ وَاللَّهُ عَلِيمٌ حَكِيمٌ | We did not send any Messenger nor a Nabi before you but that when he wished Satan cast in his wish Thereat Allah nullifies whatever Satan has cast, and then Allah confirms His signs, and Allah is All-knowing, All-wise. | Al-Hajj : 52
One thing to note, both a Nabi and Rasool are Mursal (sent by God). The word Mursal is more inclusive.
According to the above verse, not every Nabi is a Rasool.
In Surah Baqara, we read about Anbiya:
كَانَ النَّاسُ أُمَّةً وَاحِدَةً فَبَعَثَ اللَّهُ النَّبِيِّينَ مُبَشِّرِينَ وَمُنْذِرِينَ وَأَنْزَلَ مَعَهُمُ الْكِتَابَ بِالْحَقِّ لِيَحْكُمَ بَيْنَ النَّاسِ فِيمَا اخْتَلَفُوا فِيهِ ۚ وَمَا اخْتَلَفَ فِيهِ إِلَّا الَّذِينَ أُوتُوهُ مِنْ بَعْدِ مَا جَاءَتْهُمُ الْبَيِّنَاتُ بَغْيًا بَيْنَهُمْ ۖ فَهَدَى اللَّهُ الَّذِينَ آمَنُوا لِمَا اخْتَلَفُوا فِيهِ مِنَ الْحَقِّ بِإِذْنِهِ ۗ وَاللَّهُ يَهْدِي مَنْ يَشَاءُ إِلَىٰ صِرَاطٍ مُسْتَقِيمٍ | Mankind were a single community; then Allah sent the prophets as bearers of good news and warners, and He sent down with them the Book with the truth, that it may judge between the people concerning that about which they differed, and none differed in it except those who had been given it, after the manifest proofs had come to them, out of envy among themselves. Then Allah guided those who had faith to the truth of what they differed in, by His will, and Allah guides whomever He wishes to a straight path. | Al-Baqara : 213
The Anbiya have the book revealed/sent with them. This is part of their definition.
However, we read about Messengers, then some God talked to but not all.
تِلْكَ الرُّسُلُ فَضَّلْنَا بَعْضَهُمْ عَلَىٰ بَعْضٍ ۘ مِنْهُمْ مَنْ كَلَّمَ اللَّهُ ۖ وَرَفَعَ بَعْضَهُمْ دَرَجَاتٍ ۚ وَآتَيْنَا عِيسَى ابْنَ مَرْيَمَ الْبَيِّنَاتِ وَأَيَّدْنَاهُ بِرُوحِ الْقُدُسِ ۗ وَلَوْ شَاءَ اللَّهُ مَا اقْتَتَلَ الَّذِينَ مِنْ بَعْدِهِمْ مِنْ بَعْدِ مَا جَاءَتْهُمُ الْبَيِّنَاتُ وَلَٰكِنِ اخْتَلَفُوا فَمِنْهُمْ مَنْ آمَنَ وَمِنْهُمْ مَنْ كَفَرَ ۚ وَلَوْ شَاءَ اللَّهُ مَا اقْتَتَلُوا وَلَٰكِنَّ اللَّهَ يَفْعَلُ مَا يُرِيدُ | These are the Messenger, some of whom We gave an advantage over others: of them are those to whom Allah spoke and some of them He raised in rank, and We gave Jesus, son of Mary, manifest proofs and strengthened him with the Holy Spirit. Had Allah wished, those who succeeded them would not have fought one another after the manifest proofs had come to them. But they differed. So there were among them those who had faith and there were among them those who were faithless, and had Allah wished, they would not have fought one another; but Allah does whatever He desires. | Al-Baqara : 253
Now something to note, God talks to Musa's (a) mother (a) but this does not make her a Nabi or Rasool. God talks to every Messenger and Nabi just as he talked to Musa's (a) mother, this is not the issue, but here it means God's words to humanity.
What is meant by Talk to here is God's words to humanity in a form of a book. Not every Rasool hence is a Nabi.
So we see not every Nabi is a Rasool and not every Rasool is a Nabi. But how Quran uses them interchangeable in many places, we can concluded almost all Anbiya were Rusul and almost all Rusul were Anbiya.
This is because Nubuwa and Resalah compliment each other and even we can say intersect in roles often.
And these are not the only two roles of Mursaleen. Mursaleen (sent ones) are sent as witnesses, lanterns giving light, leaders, kings, authorities, guides as well.
The Quran didn't end all the roles of sent ones, but rather the following verse shows God continuously sends:
أَمْرًا مِنْ عِنْدِنَا ۚ إِنَّا كُنَّا مُرْسِلِينَ | as an ordinance from Us for We were/are/will be ever sending | Ad-Dukhaan : 5
The type of Arabic tense is hard to describe but it means WAS sending in the past, IS sending NOW, and WILL be sending in the future all at the same time. It means there is no time when God is not sending.