Old North French vs Norman-French

Old North French and Norman-French both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old North French	Yes	No	No	No
Norman-French	Yes	No	No	No

As nouns, Old North French and Norman-French are synonyms defined as:

Old North French and Norman-French: the medieval Norman dialect of Old French

Other synonyms of Old North French include Norman French.

Old North French (noun)	Norman-French (noun)
the medieval Norman dialect of Old French	the medieval Norman dialect of Old French