laguna vs lagoon

laguna and lagoon both are nouns.

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

As nouns, laguna and lagoon are synonyms defined as:

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

Other synonyms of laguna include lagune.

laguna (noun)	lagoon (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