shore up vs shore

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

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

As verbs, shore up and shore are synonyms defined as:

Other synonyms of shore up include prop, prop up.

shore 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

shore up (verb)	shore (verb)
support by placing against something solid or rigid	support by placing against something solid or rigid
	arrive on shore
	serve as a shore to