The term "atheist" only applies to people, so not exactly. You could say that a rock is "atheistic", as it lacks all beliefs (including belief in the existence of God), but I fail to see why anyone would do that.
"Atheism", by definition, is merely the absence of "theism". Both are extremely general terms. Under theism there is polytheism, monotheism, deism, etc. Under "atheism" there is implicit atheism (as with babies), explicit atheism (the declaration that one does not believe in God), strong atheism (the claim that God does not or cannot exist), etc.
They are general terms for a reason. Not much is claimed with either term.