caribou vs Rangifer tarandus

caribou and Rangifer tarandus both are nouns.

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

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

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

Other synonyms of caribou include Greenland caribou, reindeer.

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