Whilst some people feel strongly about these words, they are now often used interchangeably. A commonly cited distinction is that psychotherapy may go on for longer and may go deeper. They both cost about the same though and it is more important that you feel comfortable with the person than what they call themselves. It may be useful for you to know that whoever you are working with is a qualified member of a certifying institution, like the UK Council for Psychotherapy (UKCP), which is my governing body.