reindeer vs Rangifer tarandus

reindeer and Rangifer tarandus both are nouns.

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

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

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

Other synonyms of reindeer include caribou, Greenland caribou.

reindeer (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