lagoon vs lake

lagoon and lake both are nouns.

Word	Noun	Adjective	Verb	Adverb
lagoon	Yes	No	No	No
lake	Yes	No	No	No

As nouns, lake is a hypernym of lagoon; that is, lake is a word with a broader meaning than lagoon:

lagoon: a body of water cut off from a larger body by a reef of sand or coral
lake: a body of (usually fresh) water surrounded by land

lagoon (noun)	lake (noun)
a body of water cut off from a larger body by a reef of sand or coral	a body of (usually fresh) water surrounded by land
	any of numerous bright translucent organic pigments
	a purplish red pigment prepared from lac or cochineal