haymow vs attic

haymow and attic both are nouns.

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

As nouns, attic is a hypernym of haymow; that is, attic is a word with a broader meaning than haymow:

haymow: a loft in a barn where hay is stored
attic: floor consisting of open space at the top of a house just below roof; often used for storage

Other hypernyms of haymow include garret, loft.

haymow (noun)	attic (noun)
a loft in a barn where hay is stored	floor consisting of open space at the top of a house just below roof; often used for storage
a mass of hay piled up in a barn for preservation	(architecture) a low wall at the top of the entablature; hides the roof
	informal terms for a human head