Declension table of ?nirvacana

Masculine	Singular	Dual	Plural
Nominative	nirvacanaḥ	nirvacanau	nirvacanāḥ
Vocative	nirvacana	nirvacanau	nirvacanāḥ
Accusative	nirvacanam	nirvacanau	nirvacanān
Instrumental	nirvacanena	nirvacanābhyām	nirvacanaiḥ nirvacanebhiḥ
Dative	nirvacanāya	nirvacanābhyām	nirvacanebhyaḥ
Ablative	nirvacanāt	nirvacanābhyām	nirvacanebhyaḥ
Genitive	nirvacanasya	nirvacanayoḥ	nirvacanānām
Locative	nirvacane	nirvacanayoḥ	nirvacaneṣu

Compound nirvacana -

Adverb -nirvacanam -nirvacanāt