Naysayers are people who express disapproval or disagreement with a particular idea, opinion, or course of action. They can be identified by various terms such as disputers (9 letters), deniers (7 letters), objectors (9 letters), ANTIS (5 letters), defiers (7 letters), and scoffers (8 letters). These terms all refer to people who oppose or challenge something, often in a mocking or sarcastic manner.