dental orthopaedics vs orthodontics

dental orthopaedics and orthodontics both are nouns.

Word	Noun	Adjective	Verb	Adverb
dental orthopaedics	Yes	No	No	No
orthodontics	Yes	No	No	No

As nouns, dental orthopaedics and orthodontics are synonyms defined as:

dental orthopaedics and orthodontics: the branch of dentistry dealing with the prevention or correction of irregularities of the teeth

Other synonyms of dental orthopaedics include dental orthopedics, orthodontia, orthodonture.

dental orthopaedics (noun)	orthodontics (noun)
the branch of dentistry dealing with the prevention or correction of irregularities of the teeth	the branch of dentistry dealing with the prevention or correction of irregularities of the teeth