carol / carrel 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. 👇
carol: (noun) joyful religious song celebrating the birth of Christ. (noun) a joyful song (usually celebrating the birth of Christ). (verb) sing carols.
carrel: (noun) French surgeon and biologist who developed a way to suture and graft blood vessels (1873-1944). (noun) small individual study area in a library.
carol: k·AE·r·ah·l
carrel: k·AE·r·ah·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)