WordNet sense 1 (the flow of air that is driven backwards by an aircraft propeller):

backwash, slipstream, wash, airstream

WordNet sense 2 ((biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species):

subspecies

WordNet sense 3 (a canal for a current of water):

raceway

WordNet sense 4 (cause to move fast or to rush or race):

rush

WordNet sense 5 (step on it):

hasten, hie, hotfoot, speed, belt along, bucket along, cannonball along, pelt along, rush along

WordNet sense 6 (compete in a race):

run