River Severn vs Cambria

River Severn and Cambria both are nouns.

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

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