lagoon vs laguna

lagoon and laguna both are nouns.

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

As nouns, lagoon and laguna are synonyms defined as:

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

Other synonyms of lagoon include lagune.

lagoon (noun)	laguna (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