cut back vs curtail

cut back and curtail both are verbs.

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

As verbs, cut back and curtail are synonyms defined as:

Other synonyms of cut back include curb, restrict.

cut back (verb)	curtail (verb)
place restrictions on	place restrictions on
cut down on; make a reduction in	terminate or abbreviate before its intended or proper end or its full extent
cultivate, tend, and cut back the growth of
return in time