Declension table of ?kupātra

Neuter	Singular	Dual	Plural
Nominative	kupātram	kupātre	kupātrāṇi
Vocative	kupātra	kupātre	kupātrāṇi
Accusative	kupātram	kupātre	kupātrāṇi
Instrumental	kupātreṇa	kupātrābhyām	kupātraiḥ
Dative	kupātrāya	kupātrābhyām	kupātrebhyaḥ
Ablative	kupātrāt	kupātrābhyām	kupātrebhyaḥ
Genitive	kupātrasya	kupātrayoḥ	kupātrāṇām
Locative	kupātre	kupātrayoḥ	kupātreṣu

Compound kupātra -

Adverb -kupātram -kupātrāt