horse vs horse cavalry

horse and horse cavalry both are nouns.

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

As nouns, horse and horse cavalry are synonyms defined as:

Other synonyms of horse include cavalry.

horse (noun)	horse cavalry (noun)
solid-hoofed herbivorous quadruped domesticated since prehistoric times	an army unit mounted on horseback
a chessman shaped to resemble the head of a horse; can move two squares horizontally and one vertically (or vice versa)	troops trained to fight on horseback
a framework for holding wood that is being sawed
a padded gymnastic apparatus on legs
troops trained to fight on horseback

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