tympan vs percussive instrument

tympan and percussive instrument both are nouns.

Word	Noun	Adjective	Verb	Adverb
tympan	Yes	No	No	No
percussive instrument	Yes	No	No	No

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

tympan: a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end
percussive instrument: a musical instrument in which the sound is produced by one object striking another

Other hypernyms of tympan include percussion instrument.

tympan (noun)	percussive instrument (noun)
a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end	a musical instrument in which the sound is produced by one object striking another