jews' harp vs mouth bow

jews' harp and mouth bow both are nouns.

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

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

jews' harp and mouth bow: 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 jews' harp include jew's harp.

jews' harp (noun)	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	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