discount vs step-down

discount and step-down both are nouns.

Word	Noun	Adjective	Verb	Adverb
discount	Yes	No	Yes	No
step-down	Yes	No	No	No

As nouns, step-down is a hypernym of discount; that is, step-down is a word with a broader meaning than discount:

Other hypernyms of discount include decrease, diminution, reduction.

discount (noun)	step-down (noun)
the act of reducing the selling price of merchandise	the act of decreasing or reducing something
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

discount (verb)	step-down (verb)
bar from attention or consideration
give a reduction in price on