The word "disprover" refers to someone who disproves a statement or theory. Synonyms for this word can include "refuter," "contradictor," "denier," "challenger," "disbeliever," "skeptic," and "doubter." These words highlight the act of questioning or expressing skepticism towards a claim that is being made. Other synonyms might include "debunker," "rejectionist," "opposer," or "naysayer," which indicate a more active effort to disprove something that is being put forward. Using synonyms like these can help to add variety and nuance to your writing, and may help to better convey the specific tone or emphasis that you are trying to convey.