fuel-air bomb vs vacuum bomb

fuel-air bomb and vacuum bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
fuel-air bomb	Yes	No	No	No
vacuum bomb	Yes	No	No	No

As nouns, fuel-air bomb and vacuum bomb are synonyms defined as:

Other synonyms of fuel-air bomb include aerosol bomb, thermobaric bomb, volume-detonation bomb.

fuel-air bomb (noun)	vacuum bomb (noun)
a bomb that uses a fuel-air explosive	a bomb that uses a fuel-air explosive