tympanum vs eardrum

tympanum and eardrum both are nouns.

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

As nouns, tympanum and eardrum are synonyms defined as:

Other synonyms of tympanum include myringa, tympanic membrane.

tympanum (noun)	eardrum (noun)
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 membrane in the ear that vibrates to sound
the main cavity of the ear; between the eardrum and the inner ear