clamp down vs restrict

clamp down and restrict both are verbs.

Word	Noun	Adjective	Verb	Adverb
clamp down	No	No	Yes	No
restrict	No	No	Yes	No

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

Other hypernyms of clamp down include bound, confine, limit, throttle, trammel.

clamp down (verb)	restrict (verb)
repress or suppress (something regarded as undesirable)	place limits on (extent or amount or access)
	place restrictions on
	place under restrictions; limit access to by law
	prevent (information) from being circulated or disclosed