Suggestion dictionaries and synonyms

Well, I was looking into using Yacy Grid, but I couldn’t really find any docker info about it so I started the regular Yacy in docker on my computer - for now.

I noticed that there is an option for suggestion and synonyms. Although I don’t fully understand their purposes, I wanted to add some languages to my local install. I don’t mind creating the files myself, but I’d like to know how to make them and how to add them - and depending on how I make them, share them.

Can you please help me?

I once had a good suggestion dictionary and a free sourcce for that. But I currently cannot find it.
Does anyone has an idea where to find free synonym sources?