noun

a long, thin, flat piece of wood or other hard material, used for floors or other building purposes.

loose boards creaked as I walked on them

plank,beam,panel,slat,batten,timber,length of timber,piece of wood,lath

verb

get on or into (a ship, aircraft, or other vehicle).

we boarded the plane for Oslo

get on,enter,go on board,go aboard,step aboard,climb on,mount,ascend,embark,catch,hop on,jump on,emplane,entrain,embus