a 'fact checker' [=a person whose job is to make sure that the facts in a book, magazine, etc., are correct]
The word processing software includes a 'grammar checker'. [=a feature that finds grammatical errors]
She is a careful 'checker' of details.
(..) - Need a hyperdrive? - No way. - Babe! - I knew it! I knew that. Those guys were so lame. All they did was play space checkers. Plus, it turns out the hairy one's a dude. And the metal one too. All dudes. But won't they notice their (..)2014 The Lego Movie