* As a nationality or ethnicity: "Welsh" is a proper noun referring to the people of Wales or their culture.
* Example: "She is Welsh."
* As an adjective: "Welsh" is an adjective describing something related to Wales.
* Example: "We ate Welsh cakes."
* As a language: "Welsh" is a proper noun when referring to the language spoken in Wales.
* Example: "She learned to speak Welsh."
So, "Welsh" can be either a proper noun or an adjective, depending on its function in the sentence.