courtesy / curtesy 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. 👇
courtesy: (noun) a courteous or respectful or considerate act. (noun) a courteous or respectful or considerate remark. (noun) a courteous manner.
curtesy: NA
courtesy: k·ER·t·ah·s·iy
curtesy: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)