Declension table of sumantra

Masculine	Singular	Dual	Plural
Nominative	sumantraḥ	sumantrau	sumantrāḥ
Vocative	sumantra	sumantrau	sumantrāḥ
Accusative	sumantram	sumantrau	sumantrān
Instrumental	sumantreṇa	sumantrābhyām	sumantraiḥ sumantrebhiḥ
Dative	sumantrāya	sumantrābhyām	sumantrebhyaḥ
Ablative	sumantrāt	sumantrābhyām	sumantrebhyaḥ
Genitive	sumantrasya	sumantrayoḥ	sumantrāṇām
Locative	sumantre	sumantrayoḥ	sumantreṣu

Compound sumantra -

Adverb -sumantram -sumantrāt