coast vs littoral

coast and littoral both are nouns.

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

As nouns, littoral is a hyponym of coast; that is, littoral is a word with a more specific, narrower meaning than coast:

Other hyponyms of coast include litoral, littoral zone, sands, landfall, seaboard, seaside, tideland.

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

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

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