That would break totally my tagging and after that no one on my language family would use tags anymore. There are languages beyond germanic ones 
So I disagree. Synonyms are there because we have different words meaning same thing, and people have tendency to use and therefore search different words aka. synonyms. If they didn’t find some spesific term they don’t start over and trying some other synonym.
That couldn’t be a sitewide policy because — and now I go to harsh examples — every languages aren’t that poor there is just two words for happiness, one word for snow or mobiles or just one dialect by vocabularity — Anglos are counting english(US) and english(UK) as two separate languages (oh you poor aussies, kiwis, south africans etc…), but those aren’t, they are just using different synonyms.