Declension table of ?vivatsya

Neuter	Singular	Dual	Plural
Nominative	vivatsyam	vivatsye	vivatsyāni
Vocative	vivatsya	vivatsye	vivatsyāni
Accusative	vivatsyam	vivatsye	vivatsyāni
Instrumental	vivatsyena	vivatsyābhyām	vivatsyaiḥ
Dative	vivatsyāya	vivatsyābhyām	vivatsyebhyaḥ
Ablative	vivatsyāt	vivatsyābhyām	vivatsyebhyaḥ
Genitive	vivatsyasya	vivatsyayoḥ	vivatsyānām
Locative	vivatsye	vivatsyayoḥ	vivatsyeṣu

Compound vivatsya -

Adverb -vivatsyam -vivatsyāt