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proper - adj. (grammar) exactly correct
singular - adj. (grammar) showing or indicating no more than one person or thing
plural - adj. (grammar) showing or indicating more than one person or thing
noun - n. a word that is the name of something (such as a person, animal, place, thing, quality, idea, or action) and is typically used in a sentence as subject or object of a verb or as object of a preposition
