Clapboard :: Clapboard (n.) A narrow board, thicker at one edge than at the other; -- used for weatherboarding the outside of houses..
Clapboard :: Clapboard (v. t.) To cover with clapboards; as, to clapboard the sides of a house..
Lapboard :: Lapboard (n.) A board used on the lap as a substitute for a table, as by tailors..