tympanic cavity vs middle ear

tympanic cavity and middle ear both are nouns.

Word	Noun	Adjective	Verb	Adverb
tympanic cavity	Yes	No	No	No
middle ear	Yes	No	No	No

As nouns, tympanic cavity and middle ear are synonyms defined as:

tympanic cavity and middle ear: the main cavity of the ear; between the eardrum and the inner ear

Other synonyms of tympanic cavity include tympanum.

tympanic cavity (noun)	middle ear (noun)
the main cavity of the ear; between the eardrum and the inner ear	the main cavity of the ear; between the eardrum and the inner ear