CWK files are very old AppleWorks files, if I remember correctly. They may also be even older Claris Works files that Apple bought it and turned it into AppleWorks. Apple stopped supporting AppleWorks in 2004, so they must be quite old. I think for a long time early versions of apps that Pages supported to open them, but only for a few years.
If you only need access to some text in them, you may want to try opening them in a text editor. You may need to open the files by selecting File, Open, and then selecting the file. Or even copy the file and then change the extension from .cwk to .txt first. Then you can look through the code of the file and you can find text where you can use it.
I read somewhere that https://www.libreoffice.org will open .cwk files, so there's another option to try. Not sure if you can do the same as Word, but at least it can be the first step.
Ideally, if you found an old Mac from 2004 or just a little earlier that has AppleWorks on it, you can move the files there, open them and then save them in another format.