hair slide vs Great Britain

hair slide and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
hair slide	Yes	No	No	No
Great Britain	Yes	No	No	No

hair slide (noun)	Great Britain (noun)
a decorative hinged clip that girls and women put in their hair to hold it in place	an island comprising England and Scotland and Wales
	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