corral — “pen” / “yard”

chaps — chaparreras: leg protectors for riding through chaparral

desperado — desesperado (“desperate”)

hackamore — a kind of horse bridle taken from the Spanish jáquima (“halter”)

lasso — lazo (“tie”)

quirt (a short horseman’s whip) — a short horseman’s whip from the Spanish word cuarta (“quarter”)

ranch — rancho (“a very small rural community”)

rodeo — from rodear (“to go around”)

stampede — from estampida

10-gallon hat — from Spanish tan galán (“so gallant”), or possibly galón (“braid”)