attic vs cockloft

attic and cockloft both are nouns.

Word	Noun	Adjective	Verb	Adverb
attic	Yes	No	No	No
cockloft	Yes	No	No	No

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

attic: floor consisting of open space at the top of a house just below roof; often used for storage
cockloft: a small loft or garret

Other hyponyms of attic include hayloft, haymow, mow.

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