cut back vs ration

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

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

As verbs, ration is a hyponym of cut back; that is, ration is a word with a more specific, narrower meaning than cut back:

cut back: place restrictions on
ration: restrict the consumption of a relatively scarce commodity, as during war

Other hyponyms of cut back include abridge, immobilise, immobilize, control, restrict.

cut back (noun)	ration (noun)
	the food allowance for one day (especially for service personnel)
	a fixed portion that is allotted (especially in times of scarcity)

cut back (verb)	ration (verb)
place restrictions on	distribute in rations, as in the army
cut down on; make a reduction in	restrict the consumption of a relatively scarce commodity, as during war
cultivate, tend, and cut back the growth of
return in time