@luap42 is right, co for together and didact for learning. I submitted a bunch of *didact names through the google form: https://discordapp.com/channels/634104110131445811/637690766898233358/637713061230280704 (you can see the last one is codidact. I checked that the .com was available for all of my submissions)
@weegee I’m not sure what modification you refer to, but your initial support for that specific *didact name convinced me to get behind just that one *didact variant. I liked all of my submissions equally and was hoping one would stick.
I pronounce it exactly like @cellio describes.
@Script47 this is not the site name, anyways. Its the project name. We have yet to vote for a site name, and I will nominate Codidact for when we get to that stage. We are nowhere near there yet, though.