Declension table of ?samudra

Neuter	Singular	Dual	Plural
Nominative	samudram	samudre	samudrāṇi
Vocative	samudra	samudre	samudrāṇi
Accusative	samudram	samudre	samudrāṇi
Instrumental	samudreṇa	samudrābhyām	samudraiḥ
Dative	samudrāya	samudrābhyām	samudrebhyaḥ
Ablative	samudrāt	samudrābhyām	samudrebhyaḥ
Genitive	samudrasya	samudrayoḥ	samudrāṇām
Locative	samudre	samudrayoḥ	samudreṣu

Compound samudra -

Adverb -samudram -samudrāt