overbite vs malocclusion

overbite and malocclusion both are nouns.

Word	Noun	Adjective	Verb	Adverb
overbite	Yes	No	No	No
malocclusion	Yes	No	No	No

As nouns, malocclusion is a hypernym of overbite; that is, malocclusion is a word with a broader meaning than overbite:

overbite: (dentistry) malocclusion in which the upper teeth extend abnormally far over the lower teeth
malocclusion: (dentistry) a condition in which the opposing teeth do not mesh normally

overbite (noun)	malocclusion (noun)
(dentistry) malocclusion in which the upper teeth extend abnormally far over the lower teeth	(dentistry) a condition in which the opposing teeth do not mesh normally