four, floor & flour

The letters o-u can make both the “ow” sound and the ō sound. Why is it that four says ‘for’ and flour says ‘flower’? All you are doing is adding an “L.” And to think that a person floating down a stream is not a flow-er! What is going on here, I haven’t even made it to the thought that the word floor has the double ‘O’ which every first-grader knows makes the “ooooo” sound in words like food. This only goes to show that American’s not only enjoy braking rules (or is it rools), they seem to look (luke; wait a minute, double ‘O’ can’t make too different sounds too!) for new ones to make up just to break them. Maybe that is not what it proves (proov’s) but it seems to show that we enjoy to complicate things. If you take our and put an 'F' in front of it you get four but that 'f' now magically changes the way the 'our' sounds, add an "fl" and we are back to 'our' again. It is a good thing we do not teach kids all these words at once so that they have time to forget some of the rules before learning the next word.

read the following line out loud as fast as you can; it's a killer.
our, hour, four, flour, floor, flower, slower, flow?