Lake Baikal vs Lake Baykal

Lake Baikal and Lake Baykal both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lake Baikal	Yes	No	No	No
Lake Baykal	Yes	No	No	No

As nouns, Lake Baikal and Lake Baykal are synonyms defined as:

Lake Baikal and Lake Baykal: the largest freshwater lake in Asia or Europe and the deepest lake in the world

Other synonyms of Lake Baikal include Baikal, Baykal.

Lake Baikal (noun)	Lake Baykal (noun)
the largest freshwater lake in Asia or Europe and the deepest lake in the world	the largest freshwater lake in Asia or Europe and the deepest lake in the world