Declension table of ?pratyamitra

Neuter	Singular	Dual	Plural
Nominative	pratyamitram	pratyamitre	pratyamitrāṇi
Vocative	pratyamitra	pratyamitre	pratyamitrāṇi
Accusative	pratyamitram	pratyamitre	pratyamitrāṇi
Instrumental	pratyamitreṇa	pratyamitrābhyām	pratyamitraiḥ
Dative	pratyamitrāya	pratyamitrābhyām	pratyamitrebhyaḥ
Ablative	pratyamitrāt	pratyamitrābhyām	pratyamitrebhyaḥ
Genitive	pratyamitrasya	pratyamitrayoḥ	pratyamitrāṇām
Locative	pratyamitre	pratyamitrayoḥ	pratyamitreṣu

Compound pratyamitra -

Adverb -pratyamitram -pratyamitrāt