Synonyms/Antonyms
An antonym is a word that means the opposite of another word. For example "up" is an antonym of "down". Synonyms are words with the same or similar meaning. Synonyms for "Intelligent" are "smart" and "clever".
◂English Language Arts Worksheets and Study Guides Fourth Grade. Synonyms/Antonyms
Worksheet/Answer key
Synonyms/Antonyms 
Worksheet/Answer key
Synonyms/Antonyms Worksheet/Answer key
Synonyms/Antonyms Worksheet/Answer key
Antonyms
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Language Standards
Vocabulary Acquisition and Use
Demonstrate understanding of figurative language, word relationships, and nuances in word meanings. [L.4.5]
Demonstrate understanding of words by relating them to their opposites (antonyms) and to words with similar but not identical meanings (synonyms). [L.4.5c]