oral cavity vs cakehole

oral cavity and cakehole both are nouns.

Word	Noun	Adjective	Verb	Adverb
oral cavity	Yes	No	No	No
cakehole	Yes	No	No	No

As nouns, cakehole is a hyponym of oral cavity; that is, cakehole is a word with a more specific, narrower meaning than oral cavity:

oral cavity: the opening through which food is taken in and vocalizations emerge
cakehole: informal terms for the mouth

Other hyponyms of oral cavity include gob, hole, maw, trap, yap.

oral cavity (noun)	cakehole (noun)
the opening through which food is taken in and vocalizations emerge	informal terms for the mouth