When a child incorrectly uses a word to describe a narrower set of objects or actions than it is meant to,which type of error is a child making

Question

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Underextension is when a child uses a word to describe a narrower set of objects or actions than it is meant to, such as calling only their own pet dog "dog" and not recognizing other dogs as dogs. Telegraphic speech refers to the omission of small function words, Overextension is when a child uses a word to describe a wider set of objects or actions than it is meant to, and undergeneralization refers to a failure to apply a grammatical rule in a particular context.

When a Child Incorrectly Uses a Word to Describe a Narrower