collar vs arrest

collar and arrest both are nouns.

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

As nouns, collar and arrest are synonyms defined as:

collar and arrest: the act of apprehending (especially apprehending a criminal)

Other synonyms of collar include apprehension, catch, pinch, taking into custody.

As verbs, collar and arrest are synonyms defined as:

Other synonyms of collar include apprehend, cop, nab, nail, pick up.

collar (noun)	arrest (noun)
the act of apprehending (especially apprehending a criminal)	the act of apprehending (especially apprehending a criminal)
a figurative restraint	the state of inactivity following an interruption
a band that fits around the neck and is usually folded over
necklace that fits tightly around a woman's neck
a band of leather or rope that is placed around an animal's neck as a harness or to identify it
the stitching that forms the rim of a shoe or boot
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

collar (verb)	arrest (verb)
take into custody	hold back, as of a danger or an enemy; check the expansion or influence of
furnish with a collar	take into custody
seize by the neck or collar	attract and fix
	cause to come to an abrupt stop