What is the difference between a Chiropractor and a Chiropractitioner or a Chirotherapist?(specific to Germany)

The difference lies mainly in the duration and quality of education.
Chiropractors have completed a thorough study of chiropractic (4-6 years at university), which meets both international standards and guidelines of the World Health Organization (WHO). Chiropracticioners are “HeilpraktikerIn” alternative practitioners who have an additional training (without „standard norms“) in the field of chiropractic.

Chirotherapists are doctors with additional training in the so-called “manual medicine”.