Declension table of ?pūrvastha

Masculine	Singular	Dual	Plural
Nominative	pūrvasthaḥ	pūrvasthau	pūrvasthāḥ
Vocative	pūrvastha	pūrvasthau	pūrvasthāḥ
Accusative	pūrvastham	pūrvasthau	pūrvasthān
Instrumental	pūrvasthena	pūrvasthābhyām	pūrvasthaiḥ pūrvasthebhiḥ
Dative	pūrvasthāya	pūrvasthābhyām	pūrvasthebhyaḥ
Ablative	pūrvasthāt	pūrvasthābhyām	pūrvasthebhyaḥ
Genitive	pūrvasthasya	pūrvasthayoḥ	pūrvasthānām
Locative	pūrvasthe	pūrvasthayoḥ	pūrvastheṣu

Compound pūrvastha -

Adverb -pūrvastham -pūrvasthāt