Nouns

(n)vaulting horse, long horse, bucka gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting
(n)dollar, dollar bill, one dollar bill, buck, clama piece of paper money worth one dollar
(n)sawhorse, horse, sawbuck, bucka framework for holding wood that is being sawed
(n)buckmature male of various mammals (especially deer or antelope)

Verbs

(v)buckto strive with determination“John is bucking for a promotion”
(v)buck, go againstresist“buck the trend”
(v)tear1, shoot, shoot down, charge, buckmove quickly and violently“The car tore down the street”, “He came charging into my office”
(v)buck, jerk, hitchjump vertically, with legs stiff and back arched“the young filly bucked”