Declension table of ?vighanatva

Neuter	Singular	Dual	Plural
Nominative	vighanatvam	vighanatve	vighanatvāni
Vocative	vighanatva	vighanatve	vighanatvāni
Accusative	vighanatvam	vighanatve	vighanatvāni
Instrumental	vighanatvena	vighanatvābhyām	vighanatvaiḥ
Dative	vighanatvāya	vighanatvābhyām	vighanatvebhyaḥ
Ablative	vighanatvāt	vighanatvābhyām	vighanatvebhyaḥ
Genitive	vighanatvasya	vighanatvayoḥ	vighanatvānām
Locative	vighanatve	vighanatvayoḥ	vighanatveṣu

Compound vighanatva -

Adverb -vighanatvam -vighanatvāt