
An organ in a church has many parts that do work, much like the organs of the body do work.
The ancient Greek word
"ὄργανον" ≈ "instrument, implement" and often meant a musical instrument.
Psalms 150:4 Praise him with the timbrel and dance: praise him with stringed instruments and organs. [kjv]
αινειτε αυτον εν τυμπανω και χορω αινειτε αυτον εν χορδαις και οργανω [lxx]
… tympano … choro … cordis … organo [v]
… tympane … queer… strenegis … orgun. [wy]