Greenland caribou vs cervid

Greenland caribou and cervid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greenland caribou	Yes	No	No	No
cervid	Yes	No	No	No

As nouns, cervid is a hypernym of Greenland caribou; that is, cervid is a word with a broader meaning than Greenland caribou:

Greenland caribou: Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America
cervid: distinguished from Bovidae by the male's having solid deciduous antlers

Other hypernyms of Greenland caribou include deer.

Greenland caribou (noun)	cervid (noun)
Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America	distinguished from Bovidae by the male's having solid deciduous antlers