hand organ vs barrel organ

hand organ and barrel organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
hand organ	Yes	No	No	No
barrel organ	Yes	No	No	No

As nouns, hand organ and barrel organ are synonyms defined as:

hand organ and barrel organ: a musical instrument that makes music by rotation of a cylinder studded with pegs

Other synonyms of hand organ include grind organ.

hand organ (noun)	barrel organ (noun)
a musical instrument that makes music by rotation of a cylinder studded with pegs	a musical instrument that makes music by rotation of a cylinder studded with pegs