noun, noun which may take the genitive case particle 'no'
Used to state that two words or expressions have the same meaning. Often appears in the pattern 同義である or as a noun modifier with の.
These two words have the same meaning.
These two words are almost synonymous.
Look for a synonymous expression.
Some people use 'big' and 'huge' as synonyms.
異義 means a different meaning, the direct opposite of 同義 which means the same meaning, as contrasted in terms like 同音異義語.
同意 usually means agreement or consent, while 同義 means that two words or expressions share the same meaning; the similar sound and shared 同 kanji can cause confusion.
From 同 (same) + 義 (meaning). The kanji compound directly conveys the idea of identical meaning.