Declension table of ?vāhyatva

Neuter	Singular	Dual	Plural
Nominative	vāhyatvam	vāhyatve	vāhyatvāni
Vocative	vāhyatva	vāhyatve	vāhyatvāni
Accusative	vāhyatvam	vāhyatve	vāhyatvāni
Instrumental	vāhyatvena	vāhyatvābhyām	vāhyatvaiḥ
Dative	vāhyatvāya	vāhyatvābhyām	vāhyatvebhyaḥ
Ablative	vāhyatvāt	vāhyatvābhyām	vāhyatvebhyaḥ
Genitive	vāhyatvasya	vāhyatvayoḥ	vāhyatvānām
Locative	vāhyatve	vāhyatvayoḥ	vāhyatveṣu

Compound vāhyatva -

Adverb -vāhyatvam -vāhyatvāt