Declension table of ?sāmudra

Masculine	Singular	Dual	Plural
Nominative	sāmudraḥ	sāmudrau	sāmudrāḥ
Vocative	sāmudra	sāmudrau	sāmudrāḥ
Accusative	sāmudram	sāmudrau	sāmudrān
Instrumental	sāmudreṇa	sāmudrābhyām	sāmudraiḥ sāmudrebhiḥ
Dative	sāmudrāya	sāmudrābhyām	sāmudrebhyaḥ
Ablative	sāmudrāt	sāmudrābhyām	sāmudrebhyaḥ
Genitive	sāmudrasya	sāmudrayoḥ	sāmudrāṇām
Locative	sāmudre	sāmudrayoḥ	sāmudreṣu

Compound sāmudra -

Adverb -sāmudram -sāmudrāt