/sɪˈnɑːnɪməs/
syn·onym·ous
BrE /sɪˈnɒnɪməs/
NAmE /sɪˈnɑːnɪməs/
(of words or expressions)
having the same, or nearly the same, meaning
~ (with sth)
so closely connected with sth that the two things appear to be the same
Wealth is not necessarily synonymous with happiness.
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syn·onym·ous·ly
BrE /sɪˈnɒnɪməsli/
NAmE /sɪˈnɑːnɪməsli/