Declension table of ?kopayiṣṇu

Masculine	Singular	Dual	Plural
Nominative	kopayiṣṇuḥ	kopayiṣṇū	kopayiṣṇavaḥ
Vocative	kopayiṣṇo	kopayiṣṇū	kopayiṣṇavaḥ
Accusative	kopayiṣṇum	kopayiṣṇū	kopayiṣṇūn
Instrumental	kopayiṣṇunā	kopayiṣṇubhyām	kopayiṣṇubhiḥ
Dative	kopayiṣṇave	kopayiṣṇubhyām	kopayiṣṇubhyaḥ
Ablative	kopayiṣṇoḥ	kopayiṣṇubhyām	kopayiṣṇubhyaḥ
Genitive	kopayiṣṇoḥ	kopayiṣṇvoḥ	kopayiṣṇūnām
Locative	kopayiṣṇau	kopayiṣṇvoḥ	kopayiṣṇuṣu

Compound kopayiṣṇu -

Adverb -kopayiṣṇu