pain, pane

Pain or pain means an ache or suffering--physical or emotional--
He went to see the doctor about the pain in his leg.
Some people get a sharp pain when they eat ice cream.

Pane or pane ( rhymes with pain ) means a section of glass that makes up a window, or a section of a door made in separate panels--
Luckily, the windows have small panes, and only one is broken.
He went to the hardware store to buy a pane of glass to fix the window.

Now that you know that, you can say--
"He still has a pain in his hand from cutting it on the window pane."

Note--a window may have "panes"--
She disliked cleaning all the little panes in the front room windows.
Note # 2--A person might have "pains"--
She couldn't wait to tell the doctor about her aches and pains.
A person may also be "a pain"--
Tell your kid brother to stop being a pain.
A person may be "pained", meaning uncomfortable with something, mentally--
It pained him to think of it. It pains him to think of it.
Note # 3--to "take pains" or to be "painstaking" means to take great care with a project, or with a social dilemma--
She made sure to take pains to make her mother-in-law comfortable.
He went over the manuscript on a very painstaking and professional way.