choler / collar are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
choler: NA
collar: (noun) a band that fits around the neck and is usually folded over. (noun) (zoology) an encircling band or marking around the neck of any animal. (noun) anything worn or placed about the neck. (noun) a short ring fastened over a rod or shaft to limit, guide, or secure a machine part. (noun) the stitching that forms the rim of a shoe or boot. (noun) a band of leather or rope that is placed around an animal's neck as a harness or to identify it. (noun) a figurative restraint. (verb) take into custody. (verb) seize by the neck or collar. (verb) furnish with a collar.
choler: NA
collar: k·AA·l·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)