price reduction vs decrease

price reduction and decrease both are nouns.

Word	Noun	Adjective	Verb	Adverb
price reduction	Yes	No	No	No
decrease	Yes	No	Yes	No

As nouns, decrease is a hypernym of price reduction; that is, decrease is a word with a broader meaning than price reduction:

Other hypernyms of price reduction include diminution, reduction, step-down.

price reduction (noun)	decrease (noun)
the act of reducing the selling price of merchandise	the act of decreasing or reducing something
	the amount by which something decreases
	a change downward
	a process of becoming smaller or shorter

price reduction (verb)	decrease (verb)
	decrease in size, extent, or range
	make become smaller