Yes, Lucero Tena plays the castanets. In Spanish, "castañuelas". Check her out on YouTube. She plays the castanets for flamenco as well as Classical Music. She is fantastic!
synthesizer
A short musical idea can be called a number of things. It can be called a phrase or motif for example.
An "understudy."
You should talk to your dentist about this question.If you start back too soon, you could lose the plug of blood that seals the socket and protects the nerve root where the tooth came out. When this happens, the condition is called "dry socket," and it's extremely painful. (This answer obviously assumes you're talking about some type of wind instrument.)
You might be talking about maracas.
Whip is a percussion instrument. It is also called a slapstick.
Strings
a musical instrument? a wind instrument? a string instrument? a percussion instrument?
It is called an ocarina.
They can be called Instrument Makers.
Jazz is a type of music not a musical instrument.
banjo.
Usually, they are called a musician.
It's not a musical, but theres a play called Quillters.
There is a musical instrument called a triangle, it is both shaped, and named, the same as the three-sided figure itself.
Playing a stringed instrument by plucking the strings is called 'pizzicato'.
it's called a stylophone