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Which of the following words is classified as a conjunction?

  1. Or

  2. Happy

  3. Quickly

  4. Under

The correct answer is: Or

The word "or" is indeed classified as a conjunction. Conjunctions are words that connect clauses, sentences, or words in lists. "Or" specifically is a coordinating conjunction used to offer alternatives or choices between options. The other words in the list serve different grammatical functions: "happy" is an adjective describing a noun, "quickly" is an adverb that modifies a verb, and "under" is a preposition indicating a relationship in terms of location. Thus, "or" is the correct choice as it fits the definition and function of a conjunction.