Britain vs dickey-seat

Britain and dickey-seat both are nouns.

Word	Noun	Adjective	Verb	Adverb
Britain	Yes	No	No	No
dickey-seat	Yes	No	No	No

Britain (noun)	dickey-seat (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	a small third seat in the back of an old-fashioned two-seater