Declension table of ?kupyaka

Neuter	Singular	Dual	Plural
Nominative	kupyakam	kupyake	kupyakāni
Vocative	kupyaka	kupyake	kupyakāni
Accusative	kupyakam	kupyake	kupyakāni
Instrumental	kupyakena	kupyakābhyām	kupyakaiḥ
Dative	kupyakāya	kupyakābhyām	kupyakebhyaḥ
Ablative	kupyakāt	kupyakābhyām	kupyakebhyaḥ
Genitive	kupyakasya	kupyakayoḥ	kupyakānām
Locative	kupyake	kupyakayoḥ	kupyakeṣu

Compound kupyaka -

Adverb -kupyakam -kupyakāt