Declension table of ?mahākūpa

Masculine	Singular	Dual	Plural
Nominative	mahākūpaḥ	mahākūpau	mahākūpāḥ
Vocative	mahākūpa	mahākūpau	mahākūpāḥ
Accusative	mahākūpam	mahākūpau	mahākūpān
Instrumental	mahākūpena	mahākūpābhyām	mahākūpaiḥ mahākūpebhiḥ
Dative	mahākūpāya	mahākūpābhyām	mahākūpebhyaḥ
Ablative	mahākūpāt	mahākūpābhyām	mahākūpebhyaḥ
Genitive	mahākūpasya	mahākūpayoḥ	mahākūpānām
Locative	mahākūpe	mahākūpayoḥ	mahākūpeṣu

Compound mahākūpa -

Adverb -mahākūpam -mahākūpāt