Hi
There is nothing available out of the box.
You can configure and use any lucene analyzer under the hood.
This would allow you to expand phrase searches (entered in quotes in the UI) using synonyms, if you have a suitable analyser. As we use the same anayser for tokenisation during index and search, your synonyms would go in the index. (See the Lucene In Action book for examples).
There are no analysers that do this at the moment.
PATH seraches (used for category searches) use their own special analyser linked to the query structure used internally.
There could ba a CATEGORY field that supports synonyms specifically for categories.
For now, if you want additional paths for the same category these could be added to the category bootstrap as secondary associations. The category UI may not support this. The CategoryService does not supoprt creating and removing secondary relationships. The category will still only be able to have one name as displayed in the UI.
Regards
Andy