Cymru vs Welsh

Cymru and Welsh both are nouns.

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

Cymru (noun)	Welsh (noun)
one of the four countries that make up the United Kingdom of Great Britain and Northern Ireland; during Roman times the region was known as Cambria	a breed of dual-purpose cattle developed in Wales
	a Celtic language of Wales
	a native or resident of Wales

Cymru (adjective)	Welsh (adjective)
	of or relating to or characteristic of Wales or its people or their language