checker
noun [ C ]
uk/ˈtʃekər/ us IT
a computer program that checks something:
a grammar/spell checker
An interactive salary checker tells you what you should be earning.
They spent billions on computer firewalls, private networks, and virus checkers.
PRODUCTION
someone whose job is to check that goods are made correctly or that something is correct:
Ticket checkers identify people using the wrong ski pass.
He found himself a job as a fact checker for 'The New Yorker'.
US
someone who works on a till (= a machine which records sales and in which money is kept) in a large store, such as a supermarket:
At the store, the checkers double-bagged nearly every item.