ration vs curtail

ration is a noun but curtail is not a noun.

Word	Noun	Adjective	Verb	Adverb
ration	Yes	No	Yes	No
curtail	No	No	Yes	No

As verbs, curtail is a hypernym of ration; that is, curtail is a word with a broader meaning than ration:

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

Other hypernyms of ration include curb, cut back, restrict.

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

ration (verb)	curtail (verb)
distribute in rations, as in the army	place restrictions on
restrict the consumption of a relatively scarce commodity, as during war	terminate or abbreviate before its intended or proper end or its full extent