Declension table of ?vivrata

Neuter	Singular	Dual	Plural
Nominative	vivratam	vivrate	vivratāni
Vocative	vivrata	vivrate	vivratāni
Accusative	vivratam	vivrate	vivratāni
Instrumental	vivratena	vivratābhyām	vivrataiḥ
Dative	vivratāya	vivratābhyām	vivratebhyaḥ
Ablative	vivratāt	vivratābhyām	vivratebhyaḥ
Genitive	vivratasya	vivratayoḥ	vivratānām
Locative	vivrate	vivratayoḥ	vivrateṣu

Compound vivrata -

Adverb -vivratam -vivratāt