fusion bomb vs thermonuclear bomb

fusion bomb and thermonuclear bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
fusion bomb	Yes	No	No	No
thermonuclear bomb	Yes	No	No	No

As nouns, fusion bomb and thermonuclear bomb are synonyms defined as:

fusion bomb and thermonuclear bomb: a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium

Other synonyms of fusion bomb include H-bomb, hydrogen bomb.

fusion bomb (noun)	thermonuclear bomb (noun)
a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium	a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium