What is the term for an author’s choice of words that creates a particular effect in a text?

The term you are looking for is diction, which refers to an author’s specific choice of words that contributes to the overall meaning and effect of a text. Diction can vary greatly depending on the author’s style, the audience, or the purpose of the writing. For example, an author may choose formal, elevated language to convey seriousness or more colloquial, everyday language to create a sense of familiarity or realism. This choice of words can evoke emotions, enhance imagery, and set the mood, thereby significantly affecting how readers interpret the text.

In contrast, syntax refers to the arrangement of words and phrases to create well-formed sentences; tone reflects the author’s attitude towards the subject or audience; and theme is the underlying message or central idea of a work. While all these elements contribute to the narrative and its impact, diction specifically focuses on word choice and its implications, making it the most appropriate answer in this context.