Meaning of “synonymous” - Learner’s Dictionary

synonymous

adjective uk us /sɪˈnɒnɪməs/
CONNECTED

If one thing is synonymous with another, they are very closely connected with each other in people's minds:

It is a country where wealth is synonymous with corruption.
WORD

If one word is synonymous with another, they have the same meaning.

(Definition of “synonymous” from the Cambridge Learner’s Dictionary © Cambridge University Press)