Declension table of ?samudra

Masculine	Singular	Dual	Plural
Nominative	samudraḥ	samudrau	samudrāḥ
Vocative	samudra	samudrau	samudrāḥ
Accusative	samudram	samudrau	samudrān
Instrumental	samudreṇa	samudrābhyām	samudraiḥ samudrebhiḥ
Dative	samudrāya	samudrābhyām	samudrebhyaḥ
Ablative	samudrāt	samudrābhyām	samudrebhyaḥ
Genitive	samudrasya	samudrayoḥ	samudrāṇām
Locative	samudre	samudrayoḥ	samudreṣu

Compound samudra -

Adverb -samudram -samudrāt