Declension table of ?vacasya

Masculine	Singular	Dual	Plural
Nominative	vacasyaḥ	vacasyau	vacasyāḥ
Vocative	vacasya	vacasyau	vacasyāḥ
Accusative	vacasyam	vacasyau	vacasyān
Instrumental	vacasyena	vacasyābhyām	vacasyaiḥ vacasyebhiḥ
Dative	vacasyāya	vacasyābhyām	vacasyebhyaḥ
Ablative	vacasyāt	vacasyābhyām	vacasyebhyaḥ
Genitive	vacasyasya	vacasyayoḥ	vacasyānām
Locative	vacasye	vacasyayoḥ	vacasyeṣu

Compound vacasya -

Adverb -vacasyam -vacasyāt