Lol I had to. The word "tyre" is proper in the U.K., Australia, and many other ex-commonwealth countries. It's not wrong, it's just different.
Also I believe there's a happy spot with worn tires. Front tires will wear faster, and you should rotate regularly to avoid issues. If there's a significant difference in grip between two sets (ie 2 summer, 2 winter or 2 bald and 2 new) then most definately put the best on the back. Otherwise the car is very unpredictable when traction is needed the most. Also I found it to be very undriveable in the winter.
If they are close in wear, and similar in construction (ie all winter) then I would always put the slightly better two on the front. Most of your stopping power is on the front tires, and all of your driving power is.
There's been several threads on this posted around the forum if you wish to do some further reading on the theories behind this.
Always use discretion, there's no one rule that will answer every question.