Can you place hardwood floor over tile?

This depends, most of the time, no. If you would like to put solid 3/4" nail down wood, no. If this is vinyl, even though the nails would go through the floor, it would not allow the floor to expand and contract with the seasons. Besides voiding your warranty you take a big risk the flooring will fail completely. Ceramic tile, goes without saying, you cannot nail into it. There are some types of glue that allow you to glue directly to vinyl tile. They are somewhat expensive and must be special ordered. Be sure to check with the manufacture and ask to see the product spec so you can save it with your warranty. Most engineered wood flooring can be glued, but you need to check. A floating wood floor may be placed over both vinyl and ceramic. This is assuming the floor is solid and no tile are cracked or pushed up. With all floating floors, you must have a floor level within an 1/8" in a 6 ft radius.