shore vs sustain

shore is a noun but sustain is not a noun.

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

As verbs, sustain is a hypernym of shore; that is, sustain is a word with a broader meaning than shore:

Other hypernyms of shore include hold, hold up, support.

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

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