Declension table of ?pareyivas

Neuter	Singular	Dual	Plural
Nominative	pareyivat	pareyuṣī	pareyivāṃsi
Vocative	pareyivat	pareyuṣī	pareyivāṃsi
Accusative	pareyivat	pareyuṣī	pareyivāṃsi
Instrumental	pareyuṣā	pareyivadbhyām	pareyivadbhiḥ
Dative	pareyuṣe	pareyivadbhyām	pareyivadbhyaḥ
Ablative	pareyuṣaḥ	pareyivadbhyām	pareyivadbhyaḥ
Genitive	pareyuṣaḥ	pareyuṣoḥ	pareyuṣām
Locative	pareyuṣi	pareyuṣoḥ	pareyivatsu

Compound pareyivat -

Adverb -pareyivas