Which word is used to join together two words, phrases, or clauses?

The word that is used to join together two words, phrases, or clauses is a conjunction. Conjunctions are essential components of English grammar, facilitating the connection of ideas and enhancing the flow of sentences. Common examples of conjunctions include "and," "but," and "or."

These words allow a speaker or writer to create compound sentences, which can express more complex thoughts by linking different parts of a sentence together. For instance, in the sentence "I want to go for a walk, but it is raining," the conjunction "but" connects two related clauses, indicating a contrast between the desire to walk and the current weather conditions.

Understanding conjunctions is crucial for constructing coherent and well-structured sentences, as they provide clarity and improve readability. Other parts of speech, such as interjections, nouns, and verbs, serve different functions in a sentence and do not serve the primary purpose of connecting or joining elements.