horse vs Equus

horse and Equus both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse	Yes	No	Yes	No
Equus	Yes	No	No	No

horse (noun)	Equus (noun)
solid-hoofed herbivorous quadruped domesticated since prehistoric times	type genus of the Equidae: only surviving genus of the family Equidae
a chessman shaped to resemble the head of a horse; can move two squares horizontally and one vertically (or vice versa)
a framework for holding wood that is being sawed
a padded gymnastic apparatus on legs
troops trained to fight on horseback

horse (verb)	Equus (verb)
provide with a horse or horses