Lake Geneva vs Lake Leman

Lake Geneva and Lake Leman both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lake Geneva	Yes	No	No	No
Lake Leman	Yes	No	No	No

As nouns, Lake Geneva and Lake Leman are synonyms defined as:

Lake Geneva and Lake Leman: a lake between southwestern Switzerland and France that is crossed from east to west by the Rhone

Lake Geneva (noun)	Lake Leman (noun)
a lake between southwestern Switzerland and France that is crossed from east to west by the Rhone	a lake between southwestern Switzerland and France that is crossed from east to west by the Rhone