Declension table of ?arivas

Masculine	Singular	Dual	Plural
Nominative	arivān	arivāṃsau	arivāṃsaḥ
Vocative	arivan	arivāṃsau	arivāṃsaḥ
Accusative	arivāṃsam	arivāṃsau	aruṣaḥ
Instrumental	aruṣā	arivadbhyām	arivadbhiḥ
Dative	aruṣe	arivadbhyām	arivadbhyaḥ
Ablative	aruṣaḥ	arivadbhyām	arivadbhyaḥ
Genitive	aruṣaḥ	aruṣoḥ	aruṣām
Locative	aruṣi	aruṣoḥ	arivatsu

Compound arivat -

Adverb -arivas