vacuum bomb vs fuel-air bomb

vacuum bomb and fuel-air bomb both are nouns.

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

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

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

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