littoral zone vs coast

littoral zone and coast both are nouns.

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

As nouns, coast is a hypernym of littoral zone; that is, coast is a word with a broader meaning than littoral zone:

Other hypernyms of littoral zone include sea-coast, seacoast, seashore.

littoral zone (noun)	coast (noun)
the region of the shore of a lake or sea or ocean	the act of moving smoothly along a surface while remaining in contact with it
	the area within view
	the shore of a sea or ocean
	a slope down which sleds may coast

littoral zone (verb)	coast (verb)
	move effortlessly; by force of gravity