先駆【せんく】
forerunner, precursor, pioneer, leader, outrider, outriding
駆ける【かける】
to run, to dash, to race, to gallop (on horseback), to canter, to advance (against one's enemy), to charge (on horseback)
駆除【くじょ】
extermination (esp. pests), expulsion, destruction
駆る【かる】
to spur on, to urge forward, to impel, to drive at high speed (e.g. a car)
駆け足【かけあし】
running fast, double time, cantering, doing things in a hurry
駆逐【くちく】
extermination, expulsion, destruction
駆け回る【かけまわる】
to run around, to bustle about