Declension table of ?kupatha

Neuter	Singular	Dual	Plural
Nominative	kupatham	kupathe	kupathāni
Vocative	kupatha	kupathe	kupathāni
Accusative	kupatham	kupathe	kupathāni
Instrumental	kupathena	kupathābhyām	kupathaiḥ
Dative	kupathāya	kupathābhyām	kupathebhyaḥ
Ablative	kupathāt	kupathābhyām	kupathebhyaḥ
Genitive	kupathasya	kupathayoḥ	kupathānām
Locative	kupathe	kupathayoḥ	kupatheṣu

Compound kupatha -

Adverb -kupatham -kupathāt