curb vs restrict

curb is a noun but restrict is not a noun.

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

As verbs, curb and restrict are synonyms defined as:

Other synonyms of curb include curtail, cut back.

As verbs, restrict is a hyponym of curb; that is, restrict is a word with a more specific, narrower meaning than curb:

Other hyponyms of curb include abridge, immobilise, immobilize, ration, control.

curb (noun)	restrict (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

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