Let's break down why:
* Imperative: This means it is a command or a directive. It tells someone what to do.
* Sentence: It expresses a complete thought.
While it is a complete sentence, there isn't a single part of speech that describes the entire phrase. Each word within the sentence has its own part of speech:
* Do: Verb (present tense, helping verb)
* Not: Adverb (negation)
* Subject: Verb (present tense, active voice)
* Anyone: Pronoun (indefinite pronoun)
* To: Preposition
* Ridicule: Noun
Therefore, the sentence "do not subject anyone to ridicule" is an imperative sentence, and each word within it has its own part of speech.