middle ear vs tympanum

middle ear and tympanum both are nouns.

Word	Noun	Adjective	Verb	Adverb
middle ear	Yes	No	No	No
tympanum	Yes	No	No	No

As nouns, middle ear and tympanum are synonyms defined as:

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

Other synonyms of middle ear include tympanic cavity.

middle ear (noun)	tympanum (noun)
the main cavity of the ear; between the eardrum and the inner ear	a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it
	the membrane in the ear that vibrates to sound
	the main cavity of the ear; between the eardrum and the inner ear