bolster vs shore

bolster and shore both are nouns.

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

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

Other hypernyms of bolster include prop, prop up, shore up.

bolster (noun)	shore (noun)
a pillow that is often put across a bed underneath the regular pillows	a beam or timber that is propped against a structure to provide support
	the land along the edge of a body of water

bolster (verb)	shore (verb)
add padding to	support by placing against something solid or rigid
support and strengthen	arrive on shore
prop up with a pillow or bolster	serve as a shore to