refund vs restore

refund is a noun but restore is not a noun.

Word	Noun	Adjective	Verb	Adverb
refund	Yes	No	Yes	No
restore	No	No	Yes	No

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

Other hyponyms of refund include reimburse, restitute.

refund (noun)	restore (noun)
the act of returning money received previously
money returned to a payer

refund (verb)	restore (verb)
pay back	get or give new life or energy; return to life, regain energy, recuperate
	restore by replacing a part or putting together what is torn or broken
	give or bring back
	bring back into original existence, use, function, or position
	return to its original or usable and functioning condition