buttonkey
nounUK /ˈbʌtənkiː/
US /ˈbʌtənkiː/
A buttonkey is a small key you press to make something work.
Press the buttonkey on the toy to hear it sing.
OTHER MEANINGS
2. A key on a keyboard or keypad that you press.
She tapped the buttonkey to type a letter.
3. A small button that locks or opens something.
The buttonkey on the box popped open.
4. A button on a machine that starts or stops it.
He pressed the buttonkey to start the machine.