checker

(noun) an attendant who checks coats or baggage.

(noun) one who checks the correctness of something.

(noun) one of the flat round pieces used in playing the game of checkers. Synonyms: chequer.

(verb) mark into squares or draw squares on; draw crossed lines on. Synonyms: check, chequer.

(verb) variegate with different colors, shades, or patterns. Synonyms: chequer.