The word reproof is a noun. The plural form is reproofs.
No A reproof is a scolding. A warning is a hint of a possible scolding if a behaviour is continued.
Sam told her friend Kelly of her reproof about the guys she chooses to date.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech for "breezy" is an adjective.
The part of speech for "buried" is a verb.