Declension table of ?samudravasana

Neuter	Singular	Dual	Plural
Nominative	samudravasanam	samudravasane	samudravasanāni
Vocative	samudravasana	samudravasane	samudravasanāni
Accusative	samudravasanam	samudravasane	samudravasanāni
Instrumental	samudravasanena	samudravasanābhyām	samudravasanaiḥ
Dative	samudravasanāya	samudravasanābhyām	samudravasanebhyaḥ
Ablative	samudravasanāt	samudravasanābhyām	samudravasanebhyaḥ
Genitive	samudravasanasya	samudravasanayoḥ	samudravasanānām
Locative	samudravasane	samudravasanayoḥ	samudravasaneṣu

Compound samudravasana -

Adverb -samudravasanam -samudravasanāt