parka vs Great Britain

parka and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
parka	Yes	No	No	No
Great Britain	Yes	No	No	No

parka (noun)	Great Britain (noun)
a kind of heavy jacket	an island comprising England and Scotland and Wales
	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