hydrogen bomb vs H-bomb

hydrogen bomb and H-bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
hydrogen bomb	Yes	No	No	No
H-bomb	Yes	No	No	No

As nouns, hydrogen bomb and H-bomb are synonyms defined as:

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

Other synonyms of hydrogen bomb include fusion bomb, thermonuclear bomb.

hydrogen bomb (noun)	H-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