1. Airmail: Mail that is transported by air.
2. Postmark: A mark stamped on a piece of mail indicating the date and place of mailing.
3. Mailbox: A box where mail is delivered.
4. Mailman/Mail carrier: A person who delivers mail.
5. Mailroom: A room where mail is sorted and distributed within an organization.
6. E-mail: Electronic mail, messages sent and received through the internet.
7. Junk mail: Unsolicited mail, often considered unwanted.
8. First-class mail: A type of mail that receives priority handling and faster delivery.
9. Certified mail: A type of mail that provides proof of delivery and includes a tracking number.
10. Overnight mail: A type of mail that guarantees delivery the next day.