Declension table of ?viśastra

Masculine	Singular	Dual	Plural
Nominative	viśastraḥ	viśastrau	viśastrāḥ
Vocative	viśastra	viśastrau	viśastrāḥ
Accusative	viśastram	viśastrau	viśastrān
Instrumental	viśastreṇa	viśastrābhyām	viśastraiḥ viśastrebhiḥ
Dative	viśastrāya	viśastrābhyām	viśastrebhyaḥ
Ablative	viśastrāt	viśastrābhyām	viśastrebhyaḥ
Genitive	viśastrasya	viśastrayoḥ	viśastrāṇām
Locative	viśastre	viśastrayoḥ	viśastreṣu

Compound viśastra -

Adverb -viśastram -viśastrāt