noun
a word that represents a person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The children played games in fun at the school fair.
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We decided to prank our friend in fun, but it didn't go as planned.
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Let's go out and do something crazy in fun tonight!
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She always speaks her mind in fun, but sometimes it can hurt others' feelings.