Declension table of ?vigra

Neuter	Singular	Dual	Plural
Nominative	vigram	vigre	vigrāṇi
Vocative	vigra	vigre	vigrāṇi
Accusative	vigram	vigre	vigrāṇi
Instrumental	vigreṇa	vigrābhyām	vigraiḥ
Dative	vigrāya	vigrābhyām	vigrebhyaḥ
Ablative	vigrāt	vigrābhyām	vigrebhyaḥ
Genitive	vigrasya	vigrayoḥ	vigrāṇām
Locative	vigre	vigrayoḥ	vigreṣu

Compound vigra -

Adverb -vigram -vigrāt