littoral vs littoral zone

littoral and littoral zone both are nouns.

Word	Noun	Adjective	Verb	Adverb
littoral	Yes	Yes	No	No
littoral zone	Yes	No	No	No

As nouns, littoral and littoral zone are synonyms defined as:

littoral and littoral zone: the region of the shore of a lake or sea or ocean

Other synonyms of littoral include litoral, sands.

littoral (noun)	littoral zone (noun)
the region of the shore of a lake or sea or ocean	the region of the shore of a lake or sea or ocean

littoral (adjective)	littoral zone (adjective)
of or relating to a coastal or shore region