Four Hour Time Limit

This is one of my photos for the Black and White Photography class I'm taking. (This is a digital of the original so it's not quite as crisp.) I took the pictures on manual settings, developed the film, made a contact sheet and then developed the photograph in the dark room. I love the process. This was the first assignment with our cameras. We went on a field trip - gotta love a field trip - and took pictures around downtown Nashville. How come we pronounce four and hour differently? Except for the first letter, they are spelled the same. Makes you go, "hmmmmm..." right?