Great Britain vs perambulation

Great Britain and perambulation both are nouns.

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

Great Britain (noun)	perambulation (noun)
an island comprising England and Scotland and Wales	a leisurely walk (usually in some public place)
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 walk around a territory (a parish or manor or forest etc.) in order to officially assert and record its boundaries