human head vs attic

human head and attic both are nouns.

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

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

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

human head (noun)	attic (noun)
the head of a human being	floor consisting of open space at the top of a house just below roof; often used for storage
	(architecture) a low wall at the top of the entablature; hides the roof
	informal terms for a human head