CC-by-sa-4.0 appears to be inadequate

[softwaresinc]

All of the terms of the CC licence revolve around "copy and redistribute the material"
There is nothing that grants anyone the ability to simply use the "material" (i.e. the word data).
For example, store a word list in a database in order to make decisions based on the popularity of words entered by a user.
In that case the data is not actually shared. Some aspect of a display might change, but the "material" is not shared.