How to enable browser spell check in CKEditor 4?

It happens because contextmenu plugin is required by other plugins: Plugin "contextmenu" cannot be removed from the plugins list, because it's required by "liststyle" and "tabletools" plugin.

But actially spellcheck should work, but since the Context Menu plugin is enabled, it is necessary to hold the Ctrl key when right-clicking misspelled words to see their suggestions.

Refer CKEditor Spell Checking documentation