organ stop vs reed stop

organ stop and reed stop both are nouns.

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

As nouns, reed stop is a hyponym of organ stop; that is, reed stop is a word with a more specific, narrower meaning than organ stop:

Other hyponyms of organ stop include diapason, diapason stop, dulciana, flue stop, sourdine, voix celeste, vox angelica.

organ stop (noun)	reed stop (noun)
a graduated set of organ pipes of like tone quality	an organ stop with the tone of a reed instrument