Bass drum and Tympan

Bass drum noun - A large drum with two heads; makes a sound of indefinite but very low pitch.

Tympan and bass drum are semantically related. In some cases you can use "Tympan" instead a noun phrase "Bass drum".

Tympan noun - A musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end.

Bass drum and tympan are semantically related. Sometimes you can replace phrase "Bass drum" with "Tympan", this terms are similar.