tether vs restraint

tether and restraint both are nouns.

Word	Noun	Adjective	Verb	Adverb
tether	Yes	No	Yes	No
restraint	Yes	No	No	No

As nouns, restraint is a hypernym of tether; that is, restraint is a word with a broader meaning than tether:

tether: restraint consisting of a rope (or light chain) used to restrain an animal
restraint: a device that retards something's motion

Other hypernyms of tether include constraint.

tether (noun)	restraint (noun)
restraint consisting of a rope (or light chain) used to restrain an animal	the act of controlling by restraining someone or something
	a device that retards something's motion
	discipline in personal and social activities
	lack of ornamentation
	a rule or condition that limits freedom
	the state of being physically constrained

tether (verb)	restraint (verb)
tie with a tether