middle ear vs tympanic cavity

middle ear and tympanic cavity both are nouns.

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

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

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

Other synonyms of middle ear include tympanum.

middle ear (noun)	tympanic cavity (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