A-bomb vs atomic bomb

A-bomb and atomic bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
A-bomb	Yes	No	No	No
atomic bomb	Yes	No	No	No

As nouns, A-bomb and atomic bomb are synonyms defined as:

A-bomb and atomic bomb: a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)

Other synonyms of A-bomb include atom bomb, fission bomb, plutonium bomb.

A-bomb (noun)	atomic bomb (noun)
a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)	a nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239)