συνοχούμενον
συνοχέομαι, to travel together in a chariot
Morpho works with a static database. If you like, you can compare the output of Morpheus.
Parsed as:
present middle participle masculine accusative singular (cp συνοχέω) of συνοχέομαι
No checked forms of συνοχέομαι in the morphology database.