faultfinder , also: fault-finder

In 1651, he published the first part of the Criticón (Faultfinder) without the permission of his superiors, whom he disobeyed repeatedly.

Shmaleologists - who cares, Mr. Faultfinder Smarty-Pants?

Furthermore, Burke suspected that Felt had become an automatic faultfinder, which if true would render his advice as useless as that of an automatic yes-man.

Mr. Barthelme's fourth fast, fresh novel examines the marriage of Peter, a born suburban faultfinder, and his wife, Lily, whose shopping lists he has been correcting for 15 years.