Declension table of viśvamitra

Neuter	Singular	Dual	Plural
Nominative	viśvamitram	viśvamitre	viśvamitrāṇi
Vocative	viśvamitra	viśvamitre	viśvamitrāṇi
Accusative	viśvamitram	viśvamitre	viśvamitrāṇi
Instrumental	viśvamitreṇa	viśvamitrābhyām	viśvamitraiḥ
Dative	viśvamitrāya	viśvamitrābhyām	viśvamitrebhyaḥ
Ablative	viśvamitrāt	viśvamitrābhyām	viśvamitrebhyaḥ
Genitive	viśvamitrasya	viśvamitrayoḥ	viśvamitrāṇām
Locative	viśvamitre	viśvamitrayoḥ	viśvamitreṣu

Compound viśvamitra -

Adverb -viśvamitram -viśvamitrāt