Coarse means rough or unrefined in texture, appearance, or manner.
Course has several meanings, including:
* A path or route: "The ship took a course through the stormy seas."
* A series of lessons or studies: "I'm taking a course in computer programming."
* A part of a meal: "The main course was chicken and vegetables."
Here's an example of how to use both words in a sentence:
The coarse fabric felt uncomfortable against my skin, but the course of the journey was smooth and enjoyable.