thermonuclear warhead vs atomic warhead

thermonuclear warhead and atomic warhead both are nouns.

Word	Noun	Adjective	Verb	Adverb
thermonuclear warhead	Yes	No	No	No
atomic warhead	Yes	No	No	No

As nouns, thermonuclear warhead and atomic warhead are synonyms defined as:

thermonuclear warhead and atomic warhead: the warhead of a missile designed to deliver an atom bomb

Other synonyms of thermonuclear warhead include nuclear warhead, nuke.

thermonuclear warhead (noun)	atomic warhead (noun)
the warhead of a missile designed to deliver an atom bomb	the warhead of a missile designed to deliver an atom bomb