Declension table of ?mahāguru

Masculine	Singular	Dual	Plural
Nominative	mahāguruḥ	mahāgurū	mahāguravaḥ
Vocative	mahāguro	mahāgurū	mahāguravaḥ
Accusative	mahāgurum	mahāgurū	mahāgurūn
Instrumental	mahāguruṇā	mahāgurubhyām	mahāgurubhiḥ
Dative	mahāgurave	mahāgurubhyām	mahāgurubhyaḥ
Ablative	mahāguroḥ	mahāgurubhyām	mahāgurubhyaḥ
Genitive	mahāguroḥ	mahāgurvoḥ	mahāgurūṇām
Locative	mahāgurau	mahāgurvoḥ	mahāguruṣu

Compound mahāguru -

Adverb -mahāguru