checker vs checkers

checker and checkers both are nouns.

Word	Noun	Adjective	Verb	Adverb
checker	Yes	No	Yes	No
checkers	Yes	No	No	No

checker (noun)	checkers (noun)
one of the flat round pieces used in playing the game of checkers	a checkerboard game for two players who each have 12 pieces; the object is to jump over and so capture the opponent's pieces
one who checks the correctness of something
an attendant who checks coats or baggage

checker (verb)	checkers (verb)
variegate with different colors, shades, or patterns
mark into squares or draw squares on; draw crossed lines on