Sharepoint online and synonyms

Occasional Visitor

Using Sharepoint on line. I have defined lots of synonyms (lots of common abbreviations) in the Term Store and they work great when tagging documents in a library. If I use a synonym for a term in a search of a document library then no documents are returned but if I used the term lots are. Have I completely misunderstood how synonyms work in Search. Sorry Im a newbie.

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In SharePoint Online, the synonyms won't work directly for Search results. For that you would need to use Thesaurus but it worked only in SharePoint on prem environments and it doesn't work in SharePoint Online.
As a workaround, you can use Search Query Rules. Following post might point you in the correct direction.
https://social.technet.microsoft.com/Forums/Azure/en-US/dba144da-d285-40c5-9074-43f80c6c5e44/thesaur...