coarse / corse / course 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. 👇
coarse: (adjective) of textures that are rough to the touch or substances consisting of relatively large particles. (adjective) lacking refinement or cultivation or taste. (adjective) of low or inferior quality or value; - Shakespeare.
corse: (noun) an island in the Mediterranean; with adjacent islets it constitutes a region of France. (noun) a region of France on the island of Corsica; birthplace of Napoleon Bonaparte.
course: (noun) education imparted in a series of lessons or meetings. (noun) a connected series of events or actions or developments. (noun) general line of orientation. (noun) a mode of action. (noun) part of a meal served at one time. (noun) (construction) a layer of masonry. (noun) facility consisting of a circumscribed area of land or water laid out for a sport. (verb) move swiftly through or over. (verb) hunt with hounds.
coarse: k·AO·r·s
corse: k·AO·r·s
course: k·AO·r·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)