coast vs shore

coast and shore both are nouns.

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

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

coast (noun)	shore (noun)
the act of moving smoothly along a surface while remaining in contact with it	a beam or timber that is propped against a structure to provide support
the area within view	the land along the edge of a body of water
the shore of a sea or ocean
a slope down which sleds may coast

coast (verb)	shore (verb)
move effortlessly; by force of gravity	support by placing against something solid or rigid
	arrive on shore
	serve as a shore to