key, quay

Key or key means a device to open a lock--
He lost the key and now he can't open the door.
Key also means a legend or guide, as on a chart or plan--
Look for the key that tells what the symbols on this chart mean.
Key is also a musical term meaning overall tone or mood--
Many people think music in a minor key sounds sad.
Key also means main or most important--
Let's go over the key points again.
Key means one of the buttons on a typewriter, a piano, or some other devices or instruments--
The shift key on my computer is stuck.
He is not sure which key to press.

Quay or quay ( rhymes with key ) means a wharf, or a place for a ship to dock--
The ship was tied up at the quay.
He liked to sit on the quay, watching the ships come and go.

Now that you know that, you can say--
"One of the key points of interest is the old quay, where the old wooden ships are docked."

Note--"key" also means a reef or low island--
We left the tent on the key; we'll go back to get it tomorrow.
Note # 2--"cay" also means a reef or low island--
That cay is a great spot to watch for dolphins.