Declension table of ?duvas

Neuter	Singular	Dual	Plural
Nominative	duvat	dūṣī	duvāṃsi
Vocative	duvat	dūṣī	duvāṃsi
Accusative	duvat	dūṣī	duvāṃsi
Instrumental	dūṣā	duvadbhyām	duvadbhiḥ
Dative	dūṣe	duvadbhyām	duvadbhyaḥ
Ablative	dūṣaḥ	duvadbhyām	duvadbhyaḥ
Genitive	dūṣaḥ	dūṣoḥ	dūṣām
Locative	dūṣi	dūṣoḥ	duvatsu

Compound duvat -

Adverb -duvat