bomb vs weapons system

bomb and weapons system both are nouns.

Word	Noun	Adjective	Verb	Adverb
bomb	Yes	No	Yes	No
weapons system	Yes	No	No	No

As nouns, weapons system is a hypernym of bomb; that is, weapons system is a word with a broader meaning than bomb:

Other hypernyms of bomb include explosive device, arms, implements of war, munition, weaponry.

bomb (noun)	weapons system (noun)
an explosive device fused to explode under specific conditions	weapons considered collectively
strong sealed vessel for measuring heat of combustion
an event that fails badly or is totally ineffectual

bomb (verb)	weapons system (verb)
throw bombs at or attack with bombs
fail to get a passing grade