(n.) One who, or that which, crawls; a creeper; a reptile.

Cat Caterpillar DUKW Rome plow amphibian bulldozer calfdozer crawler creeper double-prop duck go-devil grader halftrack lawn-tractor multi-prop piston plane propeller plane propjet pusher pusher plane scraper single-prop tank tracklayer traction engine turbo-prop turbo-propeller plane twin-prop