Synonyms and Antonyms Level 5 Vol. 1 – This free, fifth-grade vocabulary lesson reviews age-appropriate synonyms and antonyms such as hinder: prevent, interfere, and assist and competent: ineffective, skillful, and capable. Students read short sentences and sort words as synonyms or antonyms. Helpful hints are provided that use each word in a sentence to help students classify the words. Specific feedback reminds students of the definition of synonyms and antonyms.