wapiti vs Cervus elaphus

wapiti and Cervus elaphus both are nouns.

Word	Noun	Adjective	Verb	Adverb
wapiti	Yes	No	No	No
Cervus elaphus	Yes	No	No	No

As nouns, wapiti and Cervus elaphus are synonyms defined as:

Other synonyms of wapiti include American elk, elk, red deer.

wapiti (noun)	Cervus elaphus (noun)
large North American deer with large much-branched antlers in the male	common deer of temperate Europe and Asia
common deer of temperate Europe and Asia