Declension table of ?sāmudra

Neuter	Singular	Dual	Plural
Nominative	sāmudram	sāmudre	sāmudrāṇi
Vocative	sāmudra	sāmudre	sāmudrāṇi
Accusative	sāmudram	sāmudre	sāmudrāṇi
Instrumental	sāmudreṇa	sāmudrābhyām	sāmudraiḥ
Dative	sāmudrāya	sāmudrābhyām	sāmudrebhyaḥ
Ablative	sāmudrāt	sāmudrābhyām	sāmudrebhyaḥ
Genitive	sāmudrasya	sāmudrayoḥ	sāmudrāṇām
Locative	sāmudre	sāmudrayoḥ	sāmudreṣu

Compound sāmudra -

Adverb -sāmudram -sāmudrāt