fusion bomb vs nuclear weapon

fusion bomb and nuclear weapon both are nouns.

Word	Noun	Adjective	Verb	Adverb
fusion bomb	Yes	No	No	No
nuclear weapon	Yes	No	No	No

As nouns, nuclear weapon is a hypernym of fusion bomb; that is, nuclear weapon is a word with a broader meaning than fusion bomb:

fusion bomb: a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium
nuclear weapon: a weapon of mass destruction whose explosive power derives from a nuclear reaction

Other hypernyms of fusion bomb include bomb, atomic weapon.

fusion bomb (noun)	nuclear weapon (noun)
a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium	a weapon of mass destruction whose explosive power derives from a nuclear reaction