Word + Pos help

I’m struggling to understand what this rule is doing. Is it identifying when license/license is being used as a noun?

license must be spelled with a "c" when used as a noun in British English. Use licence. AmE/BrE: license/licence (noun singular) Please show me your license.

@Maximum,

Yes.

You see the message only if you select the text language British English. In British English, the noun is ‘licence’ not ‘license’.

The message comes from the rule LICENCE_LICENSE_NOUN_SINGULAR. You can see the XML code for the rule on Rule "License/Licence (noun)".