gran casa vs tympan

gran casa and tympan both are nouns.

Word	Noun	Adjective	Verb	Adverb
gran casa	Yes	No	No	No
tympan	Yes	No	No	No

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

gran casa: 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 gran casa include drum, membranophone.

gran casa (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