Nouns

(n)checkeran attendant who checks coats or baggage
(n)checkerone who checks the correctness of something
(n)checker, chequerone of the flat round pieces used in playing the game of checkers

Verbs

(v)check, checker, chequermark into squares or draw squares on; draw crossed lines on
(v)checker, chequervariegate with different colors, shades, or patterns