Lower Peninsula of Michigan vs Lower Peninsula

Lower Peninsula of Michigan and Lower Peninsula both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lower Peninsula of Michigan	Yes	No	No	No
Lower Peninsula	Yes	No	No	No

As nouns, Lower Peninsula of Michigan and Lower Peninsula are synonyms defined as:

Lower Peninsula of Michigan and Lower Peninsula: the part of Michigan between Lake Michigan and Lake Huron

Lower Peninsula of Michigan (noun)	Lower Peninsula (noun)
the part of Michigan between Lake Michigan and Lake Huron	the part of Michigan between Lake Michigan and Lake Huron