Following is a verse from the Srimad Bhagavatam.
vadanti tat tattva-vidas
tattvaṁ yaj jñānam advayam
brahmeti paramātmeti
bhagavān iti śabdyate
S.B. 1.2.11
vadantithey say; tatthat; tattva-vidaḥthe learned souls; tattvamthe Absolute Truth; yatwhich; jñānamknowledge; advayamnondual; brahma itiknown as Brahman; paramātmā itiknown as Paramātmā; bhagavān itiknown as Bhagavān; śabdyateit so sounded.
Learned transcendentalists who know the Absolute Truth call this nondual substance Brahman, Paramātmā or Bhagavān.
Depending upon the qualification one has acquired, a person realizes the three aspects of the Ultimate Reality - Brahman (impersonal manifestation), Paramātamā (partial manifestation), and Bhagavāna (the Supreme Personality of Godhead).