The word in the sentence provided that is an interjection is "no", since an interjection is used to express emotions, as further explained below.
What is an interjection?
An interjection is a word or phrase that conveys the speaker's emotions in an exclamatory manner. Common examples of interjections are:
The word "no" can have different functions in a sentence, one of those functions being of an interjection. "No" can be categorized as an interjection when it appears at the beginning of a sentence or completely alone, expressing a negative emotion.
With the information above in mind, we can say the word "no" in the sentence "No, you shouldn't avoid doing your homework each night" is an interjection.
Learn more about interjections here:
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