Ἀντιφωνητοῦ
ἀντιφωνητής, one who answers for, is responsible for
Morpho works with a static database. If you like, you can compare the output of Morpheus.
Parsed as:
Proper-name noun masculine genitive singular of ἀντιφωνητής
No checked forms of ἀντιφωνητής in the morphology database.