Declension table of ?pareyivas

Masculine	Singular	Dual	Plural
Nominative	pareyivān	pareyivāṃsau	pareyivāṃsaḥ
Vocative	pareyivan	pareyivāṃsau	pareyivāṃsaḥ
Accusative	pareyivāṃsam	pareyivāṃsau	pareyuṣaḥ
Instrumental	pareyuṣā	pareyivadbhyām	pareyivadbhiḥ
Dative	pareyuṣe	pareyivadbhyām	pareyivadbhyaḥ
Ablative	pareyuṣaḥ	pareyivadbhyām	pareyivadbhyaḥ
Genitive	pareyuṣaḥ	pareyuṣoḥ	pareyuṣām
Locative	pareyuṣi	pareyuṣoḥ	pareyivatsu

Compound pareyivat -

Adverb -pareyivas