Vanern vs Lake Vanern

Vanern and Lake Vanern both are nouns.

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

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

Vanern and Lake Vanern: a lake in southwestern Sweden; the largest lake in Sweden

Vanern (noun)	Lake Vanern (noun)
a lake in southwestern Sweden; the largest lake in Sweden	a lake in southwestern Sweden; the largest lake in Sweden