Felis catus vs house cat

Felis catus and house cat both are nouns.

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

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

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

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