gravity bomb vs dumb bomb

gravity bomb and dumb bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
gravity bomb	Yes	No	No	No
dumb bomb	Yes	No	No	No

As nouns, gravity bomb and dumb bomb are synonyms defined as:

gravity bomb and dumb bomb: a bomb that falls because of gravity and is not guided to a target

gravity bomb (noun)	dumb bomb (noun)
a bomb that falls because of gravity and is not guided to a target	a bomb that falls because of gravity and is not guided to a target