eardrum vs tympanum

eardrum and tympanum both are nouns.

Word	Noun	Adjective	Verb	Adverb
eardrum	Yes	No	No	No
tympanum	Yes	No	No	No

As nouns, eardrum and tympanum are synonyms defined as:

Other synonyms of eardrum include myringa, tympanic membrane.

eardrum (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