Felis catus vs Felis domesticus

Felis catus and Felis domesticus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Felis catus	Yes	No	No	No
Felis domesticus	Yes	No	No	No

As nouns, Felis catus and Felis domesticus are synonyms defined as:

Felis catus and Felis domesticus: any domesticated member of the genus Felis

Other synonyms of Felis catus include domestic cat, house cat.

Felis catus (noun)	Felis domesticus (noun)
any domesticated member of the genus Felis	any domesticated member of the genus Felis