squirrel cage vs coop

squirrel cage and coop both are nouns.

Word	Noun	Adjective	Verb	Adverb
squirrel cage	Yes	No	No	No
coop	Yes	No	No	No

As nouns, coop is a hypernym of squirrel cage; that is, coop is a word with a broader meaning than squirrel cage:

squirrel cage: cage with a cylindrical framework that rotates as a small animal runs inside it
coop: an enclosure made or wire or metal bars in which birds or animals can be kept

Other hypernyms of squirrel cage include cage.

squirrel cage (noun)	coop (noun)
cage with a cylindrical framework that rotates as a small animal runs inside it	an enclosure made or wire or metal bars in which birds or animals can be kept
	a farm building for housing poultry