periodontist vs dentist

periodontist and dentist both are nouns.

Word	Noun	Adjective	Verb	Adverb
periodontist	Yes	No	No	No
dentist	Yes	No	No	No

As nouns, dentist is a hypernym of periodontist; that is, dentist is a word with a broader meaning than periodontist:

periodontist: a dentist specializing in diseases of the gums and other structure surrounding the teeth
dentist: a person qualified to practice dentistry

Other hypernyms of periodontist include dental practitioner, tooth doctor.

periodontist (noun)	dentist (noun)
a dentist specializing in diseases of the gums and other structure surrounding the teeth	a person qualified to practice dentistry