biteplate vs dental appliance

biteplate and dental appliance both are nouns.

Word	Noun	Adjective	Verb	Adverb
biteplate	Yes	No	No	No
dental appliance	Yes	No	No	No

As nouns, dental appliance is a hypernym of biteplate; that is, dental appliance is a word with a broader meaning than biteplate:

biteplate: a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes
dental appliance: a device to repair teeth or replace missing teeth

biteplate (noun)	dental appliance (noun)
a removable dental appliance that is worn in the palate for diagnostic or therapeutic purposes	a device to repair teeth or replace missing teeth