In order to provide access to other plugin for the user with ‘Editor’ role you need to know what capabilities that plugin uses to protect its menu. Send here the download link to that plugin. I will help you to define them.
If custom post type uses the built-in capabilities set from the posts, it is not possible to isolate access to them from the built-in posts using just user roles and capabilities. One of the possible solutions is “Admin menu access” add-on to the User Role Editor Pro:
https://www.role-editor.com/block-admin-menu-items
It is the easiest way to define what capabilities are used by some plugin too. You just open “Admin menu” for the “Administrator” role and look, what capabilities are in use to protect needed menu.
In order to revoke access to the ‘Pages’ from the ‘Editor’ role exclude from it all capabilities which includes ‘_pages’: ‘edit_pages’, ‘edit_others_pages’, etc.
