Declension table of ?kupāyu

Neuter	Singular	Dual	Plural
Nominative	kupāyu	kupāyunī	kupāyūni
Vocative	kupāyu	kupāyunī	kupāyūni
Accusative	kupāyu	kupāyunī	kupāyūni
Instrumental	kupāyunā	kupāyubhyām	kupāyubhiḥ
Dative	kupāyune	kupāyubhyām	kupāyubhyaḥ
Ablative	kupāyunaḥ	kupāyubhyām	kupāyubhyaḥ
Genitive	kupāyunaḥ	kupāyunoḥ	kupāyūnām
Locative	kupāyuni	kupāyunoḥ	kupāyuṣu

Compound kupāyu -

Adverb -kupāyu