Ἀργῖνον

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 Ἄργεννον)
Proper-name noun neuter vocative singular (cp Ἄργεννον)
✓ Proper-name noun neuter accusative singular (cp Ἄργεννον) of Ἀργῖνον