mouth bow vs jews' harp

mouth bow and jews' harp both are nouns.

Word	Noun	Adjective	Verb	Adverb
mouth bow	Yes	No	No	No
jews' harp	Yes	No	No	No

As nouns, mouth bow and jews' harp are synonyms defined as:

mouth bow and jews' harp: 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

Other synonyms of mouth bow include jew's harp.

mouth bow (noun)	jews' harp (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	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