collar vs restraint

collar and restraint both are nouns.

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

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

collar (noun)	restraint (noun)
the act of apprehending (especially apprehending a criminal)	the act of controlling by restraining someone or something
a figurative restraint	a device that retards something's motion
a band that fits around the neck and is usually folded over	discipline in personal and social activities
necklace that fits tightly around a woman's neck	lack of ornamentation
a band of leather or rope that is placed around an animal's neck as a harness or to identify it	a rule or condition that limits freedom
the stitching that forms the rim of a shoe or boot	the state of being physically constrained
a short ring fastened over a rod or shaft to limit, guide, or secure a machine part
anything worn or placed about the neck
(zoology) an encircling band or marking around the neck of any animal