assurance vs Great Britain

assurance and Great Britain both are nouns.

Word	Noun	Adjective	Verb	Adverb
assurance	Yes	No	No	No
Great Britain	Yes	No	No	No

assurance (noun)	Great Britain (noun)
freedom from doubt; belief in yourself and your abilities	an island comprising England and Scotland and Wales
a statement intended to inspire confidence	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 binding commitment to do or give or refrain from something
a British term for some kinds of insurance