Cymru vs River Severn

Cymru and River Severn both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cymru	Yes	No	No	No
River Severn	Yes	No	No	No

Cymru (noun)	River Severn (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 river in England and Wales flowing into the Bristol Channel; the longest river in Great Britain