counterpart
From LSJ
Sunt verba voces quibus hunc lenire dolorem possis, magnam morbi deponere partem → Words will avail the wretched mind to ease and much abate the dismal black disease.
English > Greek (Woodhouse)
subs.
P., use adj., ἀντίστροφος.
Music was a counterpart of gymnastic: P. ἦν (μουσική) ἀντίστροφος τῆς γυμναστικῆς (Plat., Rep. 522A).