macintosh vs Great Britain

macintosh and Great Britain both are nouns.

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

macintosh (noun)	Great Britain (noun)
a waterproof raincoat made of rubberized fabric	an island comprising England and Scotland and Wales
a lightweight waterproof (usually rubberized) fabric	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