Canis familiaris vs genus Canis

Canis familiaris and genus Canis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Canis familiaris	Yes	No	No	No
genus Canis	Yes	No	No	No

Canis familiaris (noun)	genus Canis (noun)
a member of the genus Canis (probably descended from the common wolf) that has been domesticated by man since prehistoric times; occurs in many breeds	type genus of the Canidae: domestic and wild dogs, wolves, jackals