Ilmen vs Lake Ilmen

Ilmen and Lake Ilmen both are nouns.

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

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

Ilmen and Lake Ilmen: a lake in northwestern Russia; drains through the Volkhov River into Lake Ladoga

Ilmen (noun)	Lake Ilmen (noun)
a lake in northwestern Russia; drains through the Volkhov River into Lake Ladoga	a lake in northwestern Russia; drains through the Volkhov River into Lake Ladoga