caribou vs Greenland caribou

caribou and Greenland caribou both are nouns.

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

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

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

Other synonyms of caribou include Rangifer tarandus, reindeer.

caribou (noun)	Greenland caribou (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