call / caul / col 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. 👇
call: (noun) a telephone connection. (noun) a special disposition (as if from a divine source) to pursue a particular course. (noun) a demand especially in the phrase. (noun) a brief social visit. (noun) a demand for a show of hands in a card game. (noun) a request. (noun) an instruction that interrupts the program being executed. (noun) a visit in an official or professional capacity. (noun) (sports) the decision made by an umpire or referee. (verb) ascribe a quality to or give a name of a common noun that reflects a quality. (verb) get or try to get into communication (with someone) by telephone. (verb) order, request, or command to come. (verb) call a meeting; invite or command to meet. (verb) read aloud to check for omissions or absentees. (verb) send a message or attempt to reach someone by radio, phone, etc.; make a signal to in order to transmit a message. (verb) utter a characteristic note or cry. (verb) stop or postpone because of adverse conditions, such as bad weather. (verb) make a stop in a harbour. (verb) demand payment of (a loan). (verb) give the calls (to the dancers) for a square dance. (verb) indicate a decision in regard to. (verb) require the presentation of for redemption before maturation. (verb) challenge (somebody) to make good on a statement; charge with or censure for an offense. (verb) declare in the capacity of an umpire or referee. (verb) lure by imitating the characteristic call of an animal. (verb) order or request or give a command for. (verb) order, summon, or request for a specific duty or activity, work, role. (verb) utter in a loud voice or announce. (verb) challenge the sincerity or truthfulness of. (verb) consider or regard as being. (verb) rouse somebody from sleep with a call.
caul: (noun) the inner membrane of embryos in higher vertebrates (especially when covering the head at birth).
col: (noun) a pass between mountain peaks.
call: k·AO·l
caul: k·AA·l
col: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)