sy ‧ non ‧ y ‧ mous /səˈnɒnəməs, sɪˈnɒnəməs $ -ˈnɑː-/ BrE AmE adjective
1 . something that is synonymous with something else is considered to be very closely connected with it
synonymous with
Nixon’s name has become synonymous with political scandal.
2 . two words that are synonymous have the same meaning
—synonymously adverb