thermonuclear warhead vs nuclear weapon

thermonuclear warhead and nuclear weapon both are nouns.

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

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