Great Britain vs lollipop lady

Great Britain and lollipop lady both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Britain	Yes	No	No	No
lollipop lady	Yes	No	No	No

Great Britain (noun)	lollipop lady (noun)
an island comprising England and Scotland and Wales	a woman hired to help children cross a road safely near a school
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