discount vs rebate

discount and rebate both are nouns.

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

As nouns, discount and rebate are synonyms defined as:

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

Other hyponyms of discount include allow.

discount (noun)	rebate (noun)
the act of reducing the selling price of merchandise	a rectangular groove made to hold two pieces together
an amount or percentage deducted	a refund of some fraction of the amount paid
interest on an annual basis deducted in advance on a loan
a refund of some fraction of the amount paid

discount (verb)	rebate (verb)
bar from attention or consideration	cut a rebate in (timber or stone)
give a reduction in price on	join with a rebate
	give a reduction in the price during a sale