Declension table of ?mahāputra

Masculine	Singular	Dual	Plural
Nominative	mahāputraḥ	mahāputrau	mahāputrāḥ
Vocative	mahāputra	mahāputrau	mahāputrāḥ
Accusative	mahāputram	mahāputrau	mahāputrān
Instrumental	mahāputreṇa	mahāputrābhyām	mahāputraiḥ mahāputrebhiḥ
Dative	mahāputrāya	mahāputrābhyām	mahāputrebhyaḥ
Ablative	mahāputrāt	mahāputrābhyām	mahāputrebhyaḥ
Genitive	mahāputrasya	mahāputrayoḥ	mahāputrāṇām
Locative	mahāputre	mahāputrayoḥ	mahāputreṣu

Compound mahāputra -

Adverb -mahāputram -mahāputrāt