tympanic membrane vs tympanum

tympanic membrane and tympanum both are nouns.

Word	Noun	Adjective	Verb	Adverb
tympanic membrane	Yes	No	No	No
tympanum	Yes	No	No	No

As nouns, tympanic membrane and tympanum are synonyms defined as:

tympanic membrane and tympanum: the membrane in the ear that vibrates to sound

Other synonyms of tympanic membrane include eardrum, myringa.

tympanic membrane (noun)	tympanum (noun)
the membrane in the ear that vibrates to sound	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