(n.) A plane used for working the upper surface of staircase rails.

aeroplane aircraft airliner airplane alabaster amount aspire avion beading plane become airborne bench plane billiard table block plane bowling alley bowling green caliber capping plane claw skyward compass core-box plane cut dab dado plane dead flat dead level degree dovetail plane downy drag dress dub earth edge plane equalize esplanade even extent flat flatland flatten flattened float floor flush fly fly aloft flying machine fore plane gain altitude glabrate glabrescent glabrous glass glide grade grease grooving plane ground hang harrow heavier-than-air craft height homaloid homaloidal horizontal horizontal axis horizontal fault horizontal line horizontal parallax horizontal plane horizontal projection hover ice interval ivory jack plane jet plane jointer kite lay leap leave the ground ledge leiotrichous level level line level plane lubricate mahogany marble mark mean sea level measure mow notch nuance oil parterre pas peg period pitch plain planer planing machine planish plaster plateau platform point poise prairie proportion rabbet plane range ratio reach reed plane regular remove rolled round routing plane rung sash plane satin scale scope scraper plane scrub plane sea level sea of grass shade shadow shave ship silk skate skid skim slide slip smooth smooth down smooth out smooth-shaven smooth-textured smoothed out smoothen smoothened soar space spire squashed squashed flat stair standard step steppe stint suave table tabloid tabular take off tennis court terrace thumb plane tread trenching plane trodden trodden flat trying plane unbroken uniform uninterrupted unrough unroughened unruffled velvet water level zoom