Declension table of ?purotsava

Masculine	Singular	Dual	Plural
Nominative	purotsavaḥ	purotsavau	purotsavāḥ
Vocative	purotsava	purotsavau	purotsavāḥ
Accusative	purotsavam	purotsavau	purotsavān
Instrumental	purotsavena	purotsavābhyām	purotsavaiḥ purotsavebhiḥ
Dative	purotsavāya	purotsavābhyām	purotsavebhyaḥ
Ablative	purotsavāt	purotsavābhyām	purotsavebhyaḥ
Genitive	purotsavasya	purotsavayoḥ	purotsavānām
Locative	purotsave	purotsavayoḥ	purotsaveṣu

Compound purotsava -

Adverb -purotsavam -purotsavāt