In her speech about classical ballet, kendra mentioned, but did not explain, the terms entrechat and arabasque. since most of her listeners were unfamiliar with ballet, what error kendra make in her use of language

The error that Kyndra made in her use of language is she did not use language appropriate to the audience.  I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.