dentist vs dental practitioner

dentist and dental practitioner both are nouns.

Word	Noun	Adjective	Verb	Adverb
dentist	Yes	No	No	No
dental practitioner	Yes	No	No	No

As nouns, dentist and dental practitioner are synonyms defined as:

dentist and dental practitioner: a person qualified to practice dentistry

Other synonyms of dentist include tooth doctor.

dentist (noun)	dental practitioner (noun)
a person qualified to practice dentistry	a person qualified to practice dentistry