Declension table of ?heyatva

Neuter	Singular	Dual	Plural
Nominative	heyatvam	heyatve	heyatvāni
Vocative	heyatva	heyatve	heyatvāni
Accusative	heyatvam	heyatve	heyatvāni
Instrumental	heyatvena	heyatvābhyām	heyatvaiḥ
Dative	heyatvāya	heyatvābhyām	heyatvebhyaḥ
Ablative	heyatvāt	heyatvābhyām	heyatvebhyaḥ
Genitive	heyatvasya	heyatvayoḥ	heyatvānām
Locative	heyatve	heyatvayoḥ	heyatveṣu

Compound heyatva -

Adverb -heyatvam -heyatvāt