ἀρχικυβερνήτῃ
ἀρχικυβερνήτης, a chief pilot
Morpho works with a static database. If you like, you can compare the output of Morpheus.
Parsed as:
masculine dative singular of ἀρχικυβερνήτης
No checked forms of ἀρχικυβερνήτης in the morphology database.