reduce vs separate

reduce is not a noun while separate is a noun.

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

As verbs, separate is a hypernym of reduce; that is, separate is a word with a broader meaning than reduce:

Other hypernyms of reduce include divide, part.

reduce (noun)	separate (noun)
	a garment that can be purchased separately and worn in combinations with other garments
	a separately printed article that originally appeared in a larger publication

reduce (adjective)	separate (adjective)
	independent; not united or joint
	standing apart; not attached to or supported by anything
	separated according to race, sex, class, or religion
	have the connection undone; having become separate

reduce (verb)	separate (verb)
take off weight	become separated into pieces or fragments
cut down on; make a reduction in	divide into two or more branches so as to form a fork
narrow or limit	arrange or order by classes or categories
cook until very little liquid is left	mark as different
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	move or break apart
make smaller	force, take, or pull apart
reduce in size; reduce physically	divide into components or constituents
make less complex	go one's own way; move apart
reduce in scope while retaining essential elements	make a division or separation
lessen the strength or flavor of a solution or mixture	treat differently on the basis of sex or race
be cooked until very little liquid is left	separate into parts or portions
be the essential element	discontinue an association or relation; go different ways
destress and thus weaken a sound when pronouncing it	act as a barrier between; stand between
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