Declension table of ?duvas

Masculine	Singular	Dual	Plural
Nominative	duvān	duvāṃsau	duvāṃsaḥ
Vocative	duvan	duvāṃsau	duvāṃsaḥ
Accusative	duvāṃsam	duvāṃsau	dūṣaḥ
Instrumental	dūṣā	duvadbhyām	duvadbhiḥ
Dative	dūṣe	duvadbhyām	duvadbhyaḥ
Ablative	dūṣaḥ	duvadbhyām	duvadbhyaḥ
Genitive	dūṣaḥ	dūṣoḥ	dūṣām
Locative	dūṣi	dūṣoḥ	duvatsu

Compound duvat -

Adverb -duvas