Canis rufus vs Canis niger

Canis rufus and Canis niger both are nouns.

Word	Noun	Adjective	Verb	Adverb
Canis rufus	Yes	No	No	No
Canis niger	Yes	No	No	No

As nouns, Canis rufus and Canis niger are synonyms defined as:

Canis rufus and Canis niger: reddish-grey wolf of southwestern North America

Other synonyms of Canis rufus include maned wolf, red wolf.

Canis rufus (noun)	Canis niger (noun)
reddish-grey wolf of southwestern North America	reddish-grey wolf of southwestern North America