Acclaimer is a term used to describe someone who praises or applauds someone or something loudly. However, if you are searching for other words that can be used instead of acclaimer, here are a few synonyms you can consider using: applauder, appreciator, cheerleader, supporter, admirer, booster, enthusiast, laudator, panegyrist, eulogist, extoller, and advocate. These words could be used interchangeably depending on the context, but they all convey the same meaning as acclaimer. So whether you want to describe someone's approval for a performance or gesture, or the positive reception of a new concept or product, these words can be a great alternative to the term acclaimer.