Greenland caribou vs Rangifer tarandus

Greenland caribou and Rangifer tarandus both are nouns.

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

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

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

Other synonyms of Greenland caribou include caribou, reindeer.

Greenland caribou (noun)	Rangifer tarandus (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