Isle Royal National Park vs Isle Royale National Park

Isle Royal National Park and Isle Royale National Park both are nouns.

Word	Noun	Adjective	Verb	Adverb
Isle Royal National Park	Yes	No	No	No
Isle Royale National Park	Yes	No	No	No

As nouns, Isle Royal National Park and Isle Royale National Park are synonyms defined as:

Isle Royal National Park and Isle Royale National Park: a national park on an island in Michigan; includes prehistoric iron mines

Isle Royal National Park (noun)	Isle Royale National Park (noun)
a national park on an island in Michigan; includes prehistoric iron mines	a national park on an island in Michigan; includes prehistoric iron mines