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Quite simply, a singular noun is a noun that refers to only one person, one place, one thing, or one idea. If you look at one object and name it, you have an example of a singular noun. For example there is one lamp on my bookcase and one chair at my desk.
A collective noun is singular. Jack is correct. The grammatical explanation is that words like everybody everyone are considered to be collective nouns and treated as a singular entity, a group, a singular noun. The use of a singular noun should always have a singular verb and any related possessive adjectives should also be singular (like his or her).