hold up vs shore

hold up is not a noun while shore is a noun.

Word	Noun	Adjective	Verb	Adverb
hold up	No	No	Yes	No
shore	Yes	No	Yes	No

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

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

hold up (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

hold up (verb)	shore (verb)
cause to be slowed down or delayed	support by placing against something solid or rigid
be the physical support of; carry the weight of	arrive on shore
hold up something as an example; hold up one's achievements for admiration	serve as a shore to
rob at gunpoint or by means of some other threat
continue to live and avoid dying
resist or withstand wear, criticism, etc.
resist or confront with resistance