1) Broncho 2) Bronco 3) Buckaroo bucker 4) Bucker 5) Bucker at a rodeo 6) Bucker under a buckaroo 7) Bucking beast 8) Bucking horse 9) Busted creature 10) Clown injurer, sometimes 11) Cowboy bucker 12) Critter for Tex to tame 13) Denver footballer 14) Fast bucker 15) Feral horse, casually 16) Horse for busting 1) Broncho 2) Bronco 3) Hoss 
bronco: to bust a bronc.