Course:
* Meaning: A path, route, or direction. It can also refer to a series of lessons, a part of a meal, or a general direction or trend.
* Examples:
* "The ship sailed on a steady course."
* "We took a cooking course."
* "The course of history is unpredictable."
Coarse:
* Meaning: Rough or unrefined in texture or quality. It can also refer to something that is rude or vulgar.
* Examples:
* "The fabric felt coarse against my skin."
* "He used coarse language."
* "The bread was made with coarse flour."
In a nutshell:
* Course: refers to a path or direction, or a set of lessons.
* Coarse: refers to a rough texture or quality, or rude behavior.