Canis lupus vs grey wolf

Canis lupus and grey wolf both are nouns.

Word	Noun	Adjective	Verb	Adverb
Canis lupus	Yes	No	No	No
grey wolf	Yes	No	No	No

As nouns, Canis lupus and grey wolf are synonyms defined as:

Canis lupus and grey wolf: a wolf with a brindled grey coat living in forested northern regions of North America

Other synonyms of Canis lupus include gray wolf, timber wolf.

Canis lupus (noun)	grey wolf (noun)
a wolf with a brindled grey coat living in forested northern regions of North America	a wolf with a brindled grey coat living in forested northern regions of North America