restrict vs curb

restrict is not a noun while curb is a noun.

Word	Noun	Adjective	Verb	Adverb
restrict	No	No	Yes	No
curb	Yes	No	Yes	No

As verbs, restrict and curb are synonyms defined as:

Other synonyms of restrict include curtail, cut back.

As verbs, curb is a hypernym of restrict; that is, curb is a word with a broader meaning than restrict:

Other hypernyms of restrict include curtail, cut back, restrict.

restrict (noun)	curb (noun)
	the act of restraining power or action or limiting excess
	an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)
	a horse's bit with an attached chain or strap to check the horse

restrict (verb)	curb (verb)
place limits on (extent or amount or access)	place restrictions on
place restrictions on	keep to the curb
place under restrictions; limit access to by law	lessen the intensity of; temper; hold in restraint; hold or keep within limits
prevent (information) from being circulated or disclosed