Declension table of ?suvacana

Neuter	Singular	Dual	Plural
Nominative	suvacanam	suvacane	suvacanāni
Vocative	suvacana	suvacane	suvacanāni
Accusative	suvacanam	suvacane	suvacanāni
Instrumental	suvacanena	suvacanābhyām	suvacanaiḥ
Dative	suvacanāya	suvacanābhyām	suvacanebhyaḥ
Ablative	suvacanāt	suvacanābhyām	suvacanebhyaḥ
Genitive	suvacanasya	suvacanayoḥ	suvacanānām
Locative	suvacane	suvacanayoḥ	suvacaneṣu

Compound suvacana -

Adverb -suvacanam -suvacanāt