coop vs birdcage

coop and birdcage both are nouns.

Word	Noun	Adjective	Verb	Adverb
coop	Yes	No	No	No
birdcage	Yes	No	No	No

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

coop: an enclosure made or wire or metal bars in which birds or animals can be kept
birdcage: a cage in which a bird can be kept

Other hyponyms of coop include hutch, squirrel cage.

coop (noun)	birdcage (noun)
an enclosure made or wire or metal bars in which birds or animals can be kept	a cage in which a bird can be kept
a farm building for housing poultry