Declension table of ?pratyāsvara

Neuter	Singular	Dual	Plural
Nominative	pratyāsvaram	pratyāsvare	pratyāsvarāṇi
Vocative	pratyāsvara	pratyāsvare	pratyāsvarāṇi
Accusative	pratyāsvaram	pratyāsvare	pratyāsvarāṇi
Instrumental	pratyāsvareṇa	pratyāsvarābhyām	pratyāsvaraiḥ
Dative	pratyāsvarāya	pratyāsvarābhyām	pratyāsvarebhyaḥ
Ablative	pratyāsvarāt	pratyāsvarābhyām	pratyāsvarebhyaḥ
Genitive	pratyāsvarasya	pratyāsvarayoḥ	pratyāsvarāṇām
Locative	pratyāsvare	pratyāsvarayoḥ	pratyāsvareṣu

Compound pratyāsvara -

Adverb -pratyāsvaram -pratyāsvarāt