Πελόπιον

Morpho works with a static database. If you like, you can compare the output of Morpheus.

Parsed as:

✓ Proper-name noun neuter nominative singular (cp Πέλοψ)
Proper-name noun neuter vocative singular (cp Πέλοψ)
Proper-name noun neuter accusative singular (cp Πέλοψ) of Πελόπιον