You cannot tile over wood. You need to set and fasten a cement or tile backer board for the floor to expand against and the tile to bond to.
Be careful you don't raise the level too much.
For more information:
Read "Is there a concern about formaldehyde or other toxins in either engineered wood or laminate flooring? I am thinking of replacing tile floor." a Q&A answered by Cynthia Phakos.