Declension table of ?vivas

Neuter	Singular	Dual	Plural
Nominative	vivat	vuṣī	vivāṃsi
Vocative	vivat	vuṣī	vivāṃsi
Accusative	vivat	vuṣī	vivāṃsi
Instrumental	vuṣā	vivadbhyām	vivadbhiḥ
Dative	vuṣe	vivadbhyām	vivadbhyaḥ
Ablative	vuṣaḥ	vivadbhyām	vivadbhyaḥ
Genitive	vuṣaḥ	vuṣoḥ	vuṣām
Locative	vuṣi	vuṣoḥ	vivatsu

Compound vivat -

Adverb -vivas