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.
The part of speech for this particular word is a noun.
part of speech
Sam told her friend Kelly of her reproof about the guys she chooses to date.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.