Synonyms for Checker:

n.

controller, checking staff, backgammon, checkers, Tallier, cashier, bagatelle, inspector, examining officer, checking department, domino, chess, checkerboard, board game, rechecker, tally man, counter, Chinese Checkers, validator, department of weights and measures, examiner. auctioneer, booking clerk, greeter, bagger, buyer, clerk, hawker, drummer. checker (noun)
check, chequer.
examiner (noun)
inspector.
inspector (noun)
checkers, controller.
prober (noun)
examiner.
tester (noun)
examiner.

v.

change (verb)
chequer.
creation (verb)
check, chequer.
variegate (verb)
tessellate, color, freckle, striate, check, fleck, streak, marble, colorize, stripe, dapple.

Other synonyms:

hawker, bagger, checkerboard, domino, backgammon, buyer, Chinese Checkers, checkers, board game, greeter, booking clerk. clerk, cashier, drummer, bagatelle. counter. examiner
inspector.
tester
examiner.
Other relevant words:
greeter, inspector, counter, cashier, controller, checkers, examiner, clerk, bagatelle, bagger, buyer, checkerboard, domino, chequer, hawker, check.