Declension table of ?mahātapa

Masculine	Singular	Dual	Plural
Nominative	mahātapaḥ	mahātapau	mahātapāḥ
Vocative	mahātapa	mahātapau	mahātapāḥ
Accusative	mahātapam	mahātapau	mahātapān
Instrumental	mahātapena	mahātapābhyām	mahātapaiḥ mahātapebhiḥ
Dative	mahātapāya	mahātapābhyām	mahātapebhyaḥ
Ablative	mahātapāt	mahātapābhyām	mahātapebhyaḥ
Genitive	mahātapasya	mahātapayoḥ	mahātapānām
Locative	mahātape	mahātapayoḥ	mahātapeṣu

Compound mahātapa -

Adverb -mahātapam -mahātapāt