Lower-Normandy vs Lower Normandy

Lower-Normandy and Lower Normandy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lower-Normandy	Yes	No	No	No
Lower Normandy	Yes	No	No	No

As nouns, Lower-Normandy and Lower Normandy are synonyms defined as:

Other synonyms of Lower-Normandy include Basse-Normandie.

Lower-Normandy (noun)	Lower Normandy (noun)
a division of Normandy	a division of Normandy