The words are interchangeable, and no title is better than the other. Nearly every major hypnosis organization gives their graduates who complete training courses the option of choosing either the title they want.
There is an ongoing legislation issue which has everything to do with the word “therapy” and nothing to do with the word “hypnosis.” It comes down an issue of title protection. Many forms of therapy are licensed. There is no licensing program for hypnotists in the United States, United Kingdom, Canada, or Australia. The trainings and regulationsare handled by private organizations. Once again, the choice between “hypnotist” or “hypnotherapist” is most often a student checking a box on a membership application form.
Many of my clients have informed me that they began their search looking for a “hypnotist” rather than a “hypnotherapist” as perhaps they had previously gone a therapeutic route and did find success. I appreciate the sentiment, though it is an unfair comparison as, once again, the words are interchangeable and equal.