Britain vs High Commission

Britain and High Commission both are nouns.

Word	Noun	Adjective	Verb	Adverb
Britain	Yes	No	No	No
High Commission	Yes	No	No	No

Britain (noun)	High Commission (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	an embassy of one British Commonwealth country to another