sustain vs shore

sustain is not a noun while shore is a noun.

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

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

Other hyponyms of sustain include scaffold, block, carry, chock, buoy, buoy up, pole, bracket, underpin, prop, prop up, shore up, truss, brace.

sustain (noun)	shore (noun)
	a beam or timber that is propped against a structure to provide support
	the land along the edge of a body of water

sustain (verb)	shore (verb)
undergo (as of injuries and illnesses)	support by placing against something solid or rigid
establish or strengthen as with new evidence or facts	arrive on shore
admit as valid	serve as a shore to
supply with necessities and support
provide with nourishment
be the physical support of; carry the weight of
lengthen or extend in duration or space