A reproacher is someone who criticizes or censures others for their actions or behavior. Synonyms for reproacher include faultfinder, critic, denouncer, castigator, censor, carper, flak, and nitpicker. These words all describe someone who is prone to finding fault with others or pointing out flaws in their actions or words. While a reproacher may have good intentions, their constant criticism can be demotivating and discourage healthy communication. It's important to be mindful of one's tone and approach when offering feedback, and to strive for constructive criticism that encourages growth and improvement rather than just pointing out faults.