United Kingdom vs billion

United Kingdom and billion both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Kingdom	Yes	No	No	No
billion	Yes	Yes	No	No

United Kingdom (noun)	billion (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	the number that is represented as a one followed by 9 zeros
	the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen
	a very large indefinite number (usually hyperbole)

United Kingdom (adjective)	billion (adjective)
	denoting a quantity consisting of one thousand million items or units in the United States
	denoting a quantity consisting of one million million items or units in Great Britain