Britain vs Rhenish

Britain and Rhenish both are nouns.

Word	Noun	Adjective	Verb	Adverb
Britain	Yes	No	No	No
Rhenish	Yes	Yes	No	No

Britain (noun)	Rhenish (noun)
a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom	any of several white wines from the Rhine River valley in Germany (`hock' is British usage)

Britain (adjective)	Rhenish (adjective)
	of or relating to the Rhine River and the lands adjacent to it