Declension table of ?pratavas

Masculine	Singular	Dual	Plural
Nominative	pratavān	pratavāṃsau	pratavāṃsaḥ
Vocative	pratavan	pratavāṃsau	pratavāṃsaḥ
Accusative	pratavāṃsam	pratavāṃsau	pratoṣaḥ
Instrumental	pratoṣā	pratavadbhyām	pratavadbhiḥ
Dative	pratoṣe	pratavadbhyām	pratavadbhyaḥ
Ablative	pratoṣaḥ	pratavadbhyām	pratavadbhyaḥ
Genitive	pratoṣaḥ	pratoṣoḥ	pratoṣām
Locative	pratoṣi	pratoṣoḥ	pratavatsu

Compound pratavat -

Adverb -pratavas