thermonuclear bomb vs fusion bomb

thermonuclear bomb and fusion bomb both are nouns.

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

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

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

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

thermonuclear bomb (noun)	fusion 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