shore vs coast

shore and coast both are nouns.

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

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

Other hyponyms of shore include lakeshore, lakeside, sea-coast, seacoast, seashore, strand.

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

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