human head vs noodle

human head and noodle both are nouns.

Word	Noun	Adjective	Verb	Adverb
human head	Yes	No	No	No
noodle	Yes	No	No	No

As nouns, noodle is a hyponym of human head; that is, noodle is a word with a more specific, narrower meaning than human head:

Other hyponyms of human head include bullethead, attic, bean, bonce, dome, noggin.

human head (noun)	noodle (noun)
the head of a human being	informal terms for a human head
	a ribbonlike strip of pasta