lagoon vs lagune

lagoon and lagune both are nouns.

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

As nouns, lagoon and lagune are synonyms defined as:

lagoon and lagune: a body of water cut off from a larger body by a reef of sand or coral

Other synonyms of lagoon include laguna.

lagoon (noun)	lagune (noun)
a body of water cut off from a larger body by a reef of sand or coral	a body of water cut off from a larger body by a reef of sand or coral