Declension table of ?nirvacana

Neuter	Singular	Dual	Plural
Nominative	nirvacanam	nirvacane	nirvacanāni
Vocative	nirvacana	nirvacane	nirvacanāni
Accusative	nirvacanam	nirvacane	nirvacanāni
Instrumental	nirvacanena	nirvacanābhyām	nirvacanaiḥ
Dative	nirvacanāya	nirvacanābhyām	nirvacanebhyaḥ
Ablative	nirvacanāt	nirvacanābhyām	nirvacanebhyaḥ
Genitive	nirvacanasya	nirvacanayoḥ	nirvacanānām
Locative	nirvacane	nirvacanayoḥ	nirvacaneṣu

Compound nirvacana -

Adverb -nirvacanam -nirvacanāt