Declension table of ?koṣṭhya

Neuter	Singular	Dual	Plural
Nominative	koṣṭhyam	koṣṭhye	koṣṭhyāni
Vocative	koṣṭhya	koṣṭhye	koṣṭhyāni
Accusative	koṣṭhyam	koṣṭhye	koṣṭhyāni
Instrumental	koṣṭhyena	koṣṭhyābhyām	koṣṭhyaiḥ
Dative	koṣṭhyāya	koṣṭhyābhyām	koṣṭhyebhyaḥ
Ablative	koṣṭhyāt	koṣṭhyābhyām	koṣṭhyebhyaḥ
Genitive	koṣṭhyasya	koṣṭhyayoḥ	koṣṭhyānām
Locative	koṣṭhye	koṣṭhyayoḥ	koṣṭhyeṣu

Compound koṣṭhya -

Adverb -koṣṭhyam -koṣṭhyāt