The word "checker" refers to a person or a tool that is used to examine or review something carefully to ensure accuracy or to identify mistakes. Full definition
This Have, Do, Like and Favorites 7 Board Game plus 2 Worksheet Bundle includes 1 regular board game, 2 Battleship game cards with ships, 36 game or flash cards, 16 Tic - Tac - Toe or Bingo cards, one checkerboard game with checkers, a chutes and ladders board game, an animated board game, 3 photo color worksheets with answer key and one black and white worksheet with answer key. (tes.com)
My favorite band is Rise Against, and while I do have my own website I am grateful for spell checkers as I'm not the greatest speller. (meetlocalmilfs.com)
In almost every campaign coverage, media claims a role as fact checker of campaign claims and attack ads. (dotearth.blogs.nytimes.com)