black-tailed deer vs Odocoileus hemionus columbianus

black-tailed deer and Odocoileus hemionus columbianus both are nouns.

Word	Noun	Adjective	Verb	Adverb
black-tailed deer	Yes	No	No	No
Odocoileus hemionus columbianus	Yes	No	No	No

As nouns, black-tailed deer and Odocoileus hemionus columbianus are synonyms defined as:

black-tailed deer and Odocoileus hemionus columbianus: mule deer of western Rocky Mountains

Other synonyms of black-tailed deer include blacktail, blacktail deer.

black-tailed deer (noun)	Odocoileus hemionus columbianus (noun)
mule deer of western Rocky Mountains	mule deer of western Rocky Mountains