blurter means one who blurts. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From blurt + -er.
noun
- One who blurts.“At that point W. B. Crumpton, the regular blurter of truths, boasted about what many fellow Baptists might not have wanted to own up to and which they would have found embarrassing to admit.”