workhorse vs Equus caballus

workhorse and Equus caballus both are nouns.

Word	Noun	Adjective	Verb	Adverb
workhorse	Yes	No	No	No
Equus caballus	Yes	No	No	No

As nouns, Equus caballus is a hypernym of workhorse; that is, Equus caballus is a word with a broader meaning than workhorse:

workhorse: a horse used for plowing and hauling and other heavy labor
Equus caballus: solid-hoofed herbivorous quadruped domesticated since prehistoric times

Other hypernyms of workhorse include horse.

workhorse (noun)	Equus caballus (noun)
a horse used for plowing and hauling and other heavy labor	solid-hoofed herbivorous quadruped domesticated since prehistoric times
machine that performs dependably under heavy use