Verb: (Alternatively signonym).
When you're just learning new languages to say you're a 6 languager, but all your speed-learning is of synonyms.
Noun:
When in China learn Sinonyms so you can say the same things again over there.
Sino: (For Chinese, and for "Sign", as in Chinese Signs).
Verb: "You just Sinonymed yourself on interregional baby talk"
Why don't you just Chinese yourself some Sinonyms.
A similar-meaning word dat overly-critical/righteous people wag a disapproving finger and/or cluck their tongues about if you utter it.
Before you come down on someone too much about seemingly-unacceptable word-choices, be sure to consider whether you sometimes use sinonyms yourself.