Welsh vs European

Welsh and European both are nouns.

Word	Noun	Adjective	Verb	Adverb
Welsh	Yes	Yes	No	No
European	Yes	Yes	No	No

As nouns, European is a hypernym of Welsh; that is, European is a word with a broader meaning than Welsh:

Welsh (noun)	European (noun)
a breed of dual-purpose cattle developed in Wales	a native or inhabitant of Europe
a Celtic language of Wales
a native or resident of Wales

Welsh (adjective)	European (adjective)
of or relating to or characteristic of Wales or its people or their language	of or relating to or characteristic of Europe or the people of Europe