Opener (noun)

1. A device for opening something, such as a bottle or can.
2. A person or thing that opens something.

Origin:

Mid 19th century (originally us): from open + -er.

Examples:

1. I couldn't find the bottle opener, so I used a spoon.
2. The opener of the concert was a local band.
3. He was the opener of the conference.
4. This opener is designed to easily open cans.
5. The opener is a small but important tool in any kitchen.