Felis domesticus vs domestic cat

Felis domesticus and domestic cat both are nouns.

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

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

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

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

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