overall vs Great Britain

overall and Great Britain both are nouns.

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

overall (noun)	Great Britain (noun)
(usually plural) work clothing consisting of denim trousers (usually with a bib and shoulder straps)	an island comprising England and Scotland and Wales
a loose protective coverall or smock worn over ordinary clothing for dirty work	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

overall (adjective)	Great Britain (adjective)
involving only main features
including everything