syn·o·nym 
/ˈsɪnəˌnɪm/ noun
plural syn·o·nyms /ˈsɪnəˌnɪm/ noun [count] 1 : a word that has the same meaning as another word in the same language
▪ “Small” and “little” are synonyms. — often + for or of ▪ Can you think of a synonym for “original”? ▪ “Small” is a synonym of “little.” — opposite antonym 2 : a word, name, or phrase that very strongly suggests a particular idea, quality, etc. — + for ▪ He is a tyrant whose name has become a synonym for oppression.
▪ “Small” and “little” are synonyms. — often + for or of ▪ Can you think of a synonym for “original”? ▪ “Small” is a synonym of “little.” — opposite antonym
