United Kingdom vs push-bike

United Kingdom and push-bike both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom	Yes	No	No	No
push-bike	Yes	No	No	No

United Kingdom (noun)	push-bike (noun)
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 bicycle that must be pedaled