Declension table of ?mahākāśa

Masculine	Singular	Dual	Plural
Nominative	mahākāśaḥ	mahākāśau	mahākāśāḥ
Vocative	mahākāśa	mahākāśau	mahākāśāḥ
Accusative	mahākāśam	mahākāśau	mahākāśān
Instrumental	mahākāśena	mahākāśābhyām	mahākāśaiḥ mahākāśebhiḥ
Dative	mahākāśāya	mahākāśābhyām	mahākāśebhyaḥ
Ablative	mahākāśāt	mahākāśābhyām	mahākāśebhyaḥ
Genitive	mahākāśasya	mahākāśayoḥ	mahākāśānām
Locative	mahākāśe	mahākāśayoḥ	mahākāśeṣu

Compound mahākāśa -

Adverb -mahākāśam -mahākāśāt