bass drum vs tympan

bass drum and tympan both are nouns.

Word	Noun	Adjective	Verb	Adverb
bass drum	Yes	No	No	No
tympan	Yes	No	No	No

As nouns, tympan is a hypernym of bass drum; that is, tympan is a word with a broader meaning than bass drum:

bass drum: a large drum with two heads; makes a sound of indefinite but very low pitch
tympan: a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end

Other hypernyms of bass drum include drum, membranophone.

bass drum (noun)	tympan (noun)
a large drum with two heads; makes a sound of indefinite but very low pitch	a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end