Without using CSV Files - Synonyms - Where can I find the existing ones and How can I add news ones ?

Hi 

I am trying to migrate Synonyms from an old system to Sharepoint 2013. I was able to use the import process and the result set is not convincing enough that the synonyms are in the system.

Where can I see the existing synonyms in sharepoinnt 2013? How do I add new ones manually?

Thanks for your time and help

Siva