human head vs dome

human head and dome both are nouns.

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

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

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

human head (noun)	dome (noun)
the head of a human being	a hemispherical roof
	a stadium that has a roof
	informal terms for a human head
	a concave shape whose distinguishing characteristic is that the concavity faces downward