Lake Saint Clair vs Lake St. Clair

Lake Saint Clair and Lake St. Clair both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lake Saint Clair	Yes	No	No	No
Lake St. Clair	Yes	No	No	No

As nouns, Lake Saint Clair and Lake St. Clair are synonyms defined as:

Lake Saint Clair and Lake St. Clair: a lake between Ontario and Michigan; connected with Lake Huron and Lake Erie

Lake Saint Clair (noun)	Lake St. Clair (noun)
a lake between Ontario and Michigan; connected with Lake Huron and Lake Erie	a lake between Ontario and Michigan; connected with Lake Huron and Lake Erie