exchange vs reduce

exchange is a noun but reduce is not a noun.

Word	Noun	Adjective	Verb	Adverb
exchange	Yes	No	Yes	No
reduce	No	No	Yes	No

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

exchange: put in the place of another; switch seemingly equivalent items
reduce: simplify the form of a mathematical equation of expression by substituting one term for another

Other hyponyms of exchange include shift, truncate, retool, subrogate.

exchange (noun)	reduce (noun)
reciprocal transfer of equivalent sums of money (especially the currencies of different countries)
the act of putting one thing or person in the place of another:
the act of changing one thing for another thing
the act of giving something in return for something received
(chess) the capture by both players (usually on consecutive moves) of pieces of equal value
(chess) gaining (or losing) a rook in return for a knight or bishop
(sports) an unbroken sequence of several successive strokes
a workplace for buying and selling; open only to members
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
a mutual expression of views (especially an unpleasant one)
chemical process in which one atom or ion or group changes places with another

exchange (verb)	reduce (verb)
exchange or replace with another, usually of the same kind or category	take off weight
change over, change around, as to a new order or sequence	cut down on; make a reduction in
exchange a penalty for a less severe one	narrow or limit
give to, and receive from, one another	cook until very little liquid is left
put in the place of another; switch seemingly equivalent items	to remove oxygen from a compound, or cause to react with hydrogen or form a hydride, or to undergo an increase in the number of electrons
hand over one and receive another, approximately equivalent	make smaller
	reduce in size; reduce physically
	make less complex
	reduce in scope while retaining essential elements
	lessen the strength or flavor of a solution or mixture
	be cooked until very little liquid is left
	be the essential element
	destress and thus weaken a sound when pronouncing it
	undergo meiosis
	reposition (a broken bone after surgery) back to its normal site
	lower in grade or rank or force somebody into an undignified situation
	lessen and make more modest
	simplify the form of a mathematical equation of expression by substituting one term for another
	bring to humbler or weaker state or condition
	put down by force or intimidation