How do worldhoppers communicate on all the Cosmere worlds? Is there one universal language? Do they just learn a new language for each world?
There is not a universal language.
If you are viewing this on github.io, you can see that this site is open source. Please do not try to improve this page. It is auto-generated by a python script. If you have suggestions for improvements, please start a discussion on the github repo or the Discord.