* Noun: A planned route or direction of travel.
* Example: "The ship followed a course south."
* Noun: A series of lessons or studies.
* Example: "She took a course in French."
* Verb: To flow or move in a particular direction.
* Example: "The river courses through the valley."
* Adjective: Rough or uneven, often used to describe a surface.
* Example: "The ground was course and dusty."
To determine the part of speech, you need to look at the context of the sentence and how the word is being used.