You can try the following free open source resources:

• https://www.coe.int/en/web/common-european-framework-reference-languages/reference-level-descriptions
• For levels from A1 to B2 there are some textbooks for English vocabulary on the Books4Languages website that you can access and download for free (for example, here is the link for the A1 level https://open.books4languages.com/english-a1-vocabulary/ ).
• For levels C1 and C2 there are two papers provided by the University of Macedonia and that you can access and download for free from here: https://www.toe.gr/pluginfile.php?file=%2F2143%2Fmod_resource%2Fcontent%2F1%2FLevel%20C1%20Word%20List.pdf for C1 and https://www.toe.gr/pluginfile.php?file=%2F2144%2Fmod_resource%2Fcontent%2F1%2FLevel%20C2%20Word%20List.pdf for C2.

You can try the following free open source resources:

• https://www.coe.int/en/web/common-european-framework-reference-languages/reference-level-descriptions
• For levels from A1 to B2 there are some textbooks for English vocabulary on the Books4Languages website that you can access and receive a Creative Commons license (for example, here is the link for the A1 level https://open.books4languages.com/english-a1-vocabulary/ ).
• For levels C1 and C2 there are two papers provided by the University of Macedonia and that you can access and download for free from here: https://www.toe.gr/pluginfile.php?file=%2F2143%2Fmod_resource%2Fcontent%2F1%2FLevel%20C1%20Word%20List.pdf for C1 and https://www.toe.gr/pluginfile.php?file=%2F2144%2Fmod_resource%2Fcontent%2F1%2FLevel%20C2%20Word%20List.pdf for C2.