速 - quick, fast

speed per second; velocity per second

high speed; rapidity

speed; velocity; pace; rate

supersonic speed

special delivery mail; express delivery post

stall

speed; velocity; quickness; rapidity

(very) quick; rapid; swift; speedy; prompt; expeditious

rough-and-ready; knocked-up; hasty; slipshod; slapdash

highway; freeway; expressway; motorway

speed (per hour)

rapid (e.g. progress)