Predictive text

i use an iPad mini And can't find a way to turn off the predictive text.  I have looked through all the options in the control panel etc. Anyone got an idea how to do this.  I was recently using the word Daffs in a message when talking about daffodils.  The PT turned it into Daffy, Duffs and daFita (anyone know what a daFita is?).  I re-read everything I've written before sending but typos still get through.  It's driving me wild.