Felis catus vs domestic cat

Felis catus and domestic cat both are nouns.

Word	Noun	Adjective	Verb	Adverb
Felis catus	Yes	No	No	No
domestic cat	Yes	No	No	No

As nouns, Felis catus and domestic cat are synonyms defined as:

Felis catus and domestic cat: any domesticated member of the genus Felis

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

Felis catus (noun)	domestic cat (noun)
any domesticated member of the genus Felis	any domesticated member of the genus Felis