IPA: //ˈɡɛsər//
KK: /ˈɡɛsər/
A person who makes a guess or prediction, often without having enough information to be certain.
As a guesser, she often made predictions about the weather based on just a few signs.
Guesser → It is formed from "guess" (of uncertain origin, possibly from Middle English *gessen*, meaning to estimate or suppose) and "-er" (meaning a person who). A guesser is a person who makes an estimate or supposition.
Think of someone who is making an estimate or supposition — that's what a guesser does.
No commonly confused words.