reed organ vs harmonium

reed organ and harmonium both are nouns.

Word	Noun	Adjective	Verb	Adverb
reed organ	Yes	No	No	No
harmonium	Yes	No	No	No

As nouns, reed organ and harmonium are synonyms defined as:

reed organ and harmonium: a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows

Other synonyms of reed organ include organ.

reed organ (noun)	harmonium (noun)
a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows	a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows