* One who does or practices a particular activity: For example, "engineer," "volunteer," "auctioneer."
* One who is associated with a particular place: For example, "pioneer" (someone who is among the first to settle a new area), "fronteer" (someone who lives on the frontier), "refugeer" (someone who flees to another country).
The suffix "-eer" is often used to form nouns from verbs. It can also be used to create technical terms related to a specific field, such as "cashier" in finance.
It's important to note that the suffix "-eer" is not always used consistently. Some words, like "pioneer" and "fronteer," are more traditional and historical in usage, while others, like "engineer" and "volunteer," are more common and widely used.