cut back vs cutback

cut back is not a noun while cutback is a noun.

Word	Noun	Adjective	Verb	Adverb
cut back	No	No	Yes	No
cutback	Yes	No	No	No

cut back (noun)	cutback (noun)
	a reduction in quantity or rate

cut back (verb)	cutback (verb)
place restrictions on
cut down on; make a reduction in
cultivate, tend, and cut back the growth of
return in time