Rustler

1. (n.) One who, or that which, rustles.

2. (n.) A bovine animal that can care for itself in any circumstances; also, an alert, energetic, driving person.

Thesaurus Entries

activist, ball of fire, beaver, big-time operator, bustler, busy bee, doer, dynamo, eager beaver, enthusiast, human dynamo, hustler, live wire, man of action, man of deeds, militant, new broom, operator, peeler, political activist, powerhouse, rustler, self-starter, take-charge guy, wheeler-dealer, winner