mere vs Britain

mere and Britain both are nouns.

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

mere (noun)	Britain (noun)
a small pond of standing water	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

mere (adjective)	Britain (adjective)
apart from anything else; without additions or modifications
being nothing more than specified