quarterlight vs Britain

quarterlight and Britain both are nouns.

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

quarterlight (noun)	Britain (noun)
car window consisting of a small pivoted glass vent in the door of a car	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