atomic weapon vs thermonuclear warhead

atomic weapon and thermonuclear warhead both are nouns.

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

atomic weapon (noun)	thermonuclear warhead (noun)
a weapon of mass destruction whose explosive power derives from a nuclear reaction	the warhead of a missile designed to deliver an atom bomb