Declension table of ?kupūya

Neuter	Singular	Dual	Plural
Nominative	kupūyam	kupūye	kupūyāni
Vocative	kupūya	kupūye	kupūyāni
Accusative	kupūyam	kupūye	kupūyāni
Instrumental	kupūyena	kupūyābhyām	kupūyaiḥ
Dative	kupūyāya	kupūyābhyām	kupūyebhyaḥ
Ablative	kupūyāt	kupūyābhyām	kupūyebhyaḥ
Genitive	kupūyasya	kupūyayoḥ	kupūyānām
Locative	kupūye	kupūyayoḥ	kupūyeṣu

Compound kupūya -

Adverb -kupūyam -kupūyāt