refund vs discount

refund and discount both are nouns.

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

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

Other hyponyms of refund include rebate.

refund (noun)	discount (noun)
the act of returning money received previously	the act of reducing the selling price of merchandise
money returned to a payer	an amount or percentage deducted
	interest on an annual basis deducted in advance on a loan
	a refund of some fraction of the amount paid

refund (verb)	discount (verb)
pay back	bar from attention or consideration
	give a reduction in price on