saddle horse vs Equus caballus

saddle horse and Equus caballus both are nouns.

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

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

saddle horse: a lightweight horse kept for riding only
Equus caballus: solid-hoofed herbivorous quadruped domesticated since prehistoric times

Other hypernyms of saddle horse include horse.

saddle horse (noun)	Equus caballus (noun)
a lightweight horse kept for riding only	solid-hoofed herbivorous quadruped domesticated since prehistoric times