What term describes the arrangement of words in sentences, including the use of parts of speech?

The term that describes the arrangement of words in sentences, including the use of parts of speech, is syntax. Syntax focuses on how words combine to form phrases and sentences, dictating the structure and rules that govern sentence formation in a language. It encompasses the order of subjects, verbs, objects, and modifiers, contributing to the overall clarity and meaning of the sentences.

Grammar, while related, refers more broadly to the whole system and structure of a language, which includes not only syntax but also morphology, punctuation, and the rules governing sentence and word use. Semantics deals with the meaning of words and sentences rather than their structure, while phonetics focuses on the sounds of speech rather than word arrangement. Therefore, syntax is the most accurate term for this question as it directly addresses word arrangement in sentence structures.