The word "in-tern" is a noun that refers to a student or trainee who works in a professional setting to gain practical experience in their field of study. The term can be commonly found in workplaces, particularly in the medical field. However, when it comes to finding antonyms for this word, we can explore various options. Some antonyms that might come to mind are "professional," "expert," or "skilled." These words represent the opposite of a novice or beginner who is still learning the ropes. However, it is worth noting that "in-tern" is not necessarily a negative term, but rather describes a temporary and transitional position in a person's career journey.