Superior vs Lake Superior

Superior and Lake Superior both are nouns.

Word	Noun	Adjective	Verb	Adverb
Superior	Yes	No	No	No
Lake Superior	Yes	No	No	No

As nouns, Superior and Lake Superior are synonyms defined as:

Superior and Lake Superior: the largest freshwater lake in the world; the deepest of the Great Lakes

Superior (noun)	Lake Superior (noun)
a town in northwest Wisconsin on Lake Superior across from Duluth	the largest freshwater lake in the world; the deepest of the Great Lakes
the largest freshwater lake in the world; the deepest of the Great Lakes