What's the noun for domino? Here's the word you're looking for.
domino
(dominoes) A tile divided into two squares, each having 0 to 6 (or sometimes more) dots or pips (as in dice), used in the game of dominoes. [from c. 1800]
“Sometimes the fall of a single piece can set in motion two rows of dominos, each of which follows its own distinct path.”
“The council should be aware that enunciating this name has become a pub sport, alongside bar billiards, pool, darts, bear-baiting, dominos and international cricket.”
“Octogenarian men who fell out with their contemporaries, Fidel and Raúl, play out their days with dominos.”