Greenland caribou vs reindeer

Greenland caribou and reindeer both are nouns.

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

As nouns, Greenland caribou and reindeer are synonyms defined as:

Greenland caribou and reindeer: Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America

Other synonyms of Greenland caribou include caribou, Rangifer tarandus.

Greenland caribou (noun)	reindeer (noun)
Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America	Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America