sand grouse vs columbiform bird

sand grouse and columbiform bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand grouse	Yes	No	No	No
columbiform bird	Yes	No	No	No

As nouns, columbiform bird is a hypernym of sand grouse; that is, columbiform bird is a word with a broader meaning than sand grouse:

sand grouse: pigeon-like bird of arid regions of the Old World having long pointed wings and tail and precocial downy young
columbiform bird: a cosmopolitan order of land birds having small heads and short legs with four unwebbed toes

sand grouse (noun)	columbiform bird (noun)
pigeon-like bird of arid regions of the Old World having long pointed wings and tail and precocial downy young	a cosmopolitan order of land birds having small heads and short legs with four unwebbed toes