Synonyms and antonyms Tricky words for two easily understood ideas! A synonym is a word that has the same, or nearly the same meaning as another word. Happy and joyful are synonyms. An antonym is a word opposite in meaning to another word. Happy and sad are antonyms. We have just published seven sets of worksheets on synonyms and antonyms providing challenges of increasing difficulty. Our writers really enjoyed making them so look out for more later in the month. Go to Synonyms and Antonyms