tether vs constraint

tether and constraint both are nouns.

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

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

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

Other hypernyms of tether include restraint.

tether (noun)	constraint (noun)
restraint consisting of a rope (or light chain) used to restrain an animal	the act of constraining; the threat or use of force to control the thoughts or behavior of others
	a device that retards something's motion
	the state of being physically constrained

tether (verb)	constraint (verb)
tie with a tether