- Noun: Nit
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    A nit refers to a small egg or young form of a louse or other parasitic insect. Example sentence: She discovered a nit in her child's hair and immediately treated it. 
- Noun: Nit
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    Informally, nit can also be used to describe a foolish or stupid person. Example sentence: Don't be such a nit, it's just a harmless joke. 
- Verb: Nit
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    The verb nit means to remove or get rid of nits or lice eggs from hair or fur. Example sentence: She meticulously nitted her child's hair to ensure complete removal of lice. 
- Adjective: Nit
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    When used as an adjective, nit can describe something related to or characterized by nits. Example sentence: The nit infestation called for immediate action. 
- Adjective: Nit
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    Informally, nit can also mean insignificant or unimportant. Example sentence: Let's not waste time arguing about such nitty details.