This document defines synonyms, antonyms, and idiomatic expressions in 3 paragraphs. It provides examples to illustrate each term. Synonyms are words with similar meanings that can add variety, avoid repetition, and provide specificity. Antonyms are words with opposite meanings that help understanding and make writing more interesting. Idiomatic expressions are groups of words with a figurative meaning different from the literal meaning of each word. Examples are given to demonstrate idiomatic phrases.