Mouth bow and Spinet

Mouth bow noun - A small lyre-shaped musical instrument that is placed between the teeth and played by twanging a wire tongue while changing the shape of the mouth cavity.

Spinet and mouth bow are semantically related. In some cases you can use "Spinet" instead a noun phrase "Mouth bow".

Spinet noun - A small and compactly built upright piano.

Mouth bow and spinet are semantically related. You can use "Mouth bow" instead a noun "Spinet".