Declension table of ?viśvāsana

Neuter	Singular	Dual	Plural
Nominative	viśvāsanam	viśvāsane	viśvāsanāni
Vocative	viśvāsana	viśvāsane	viśvāsanāni
Accusative	viśvāsanam	viśvāsane	viśvāsanāni
Instrumental	viśvāsanena	viśvāsanābhyām	viśvāsanaiḥ
Dative	viśvāsanāya	viśvāsanābhyām	viśvāsanebhyaḥ
Ablative	viśvāsanāt	viśvāsanābhyām	viśvāsanebhyaḥ
Genitive	viśvāsanasya	viśvāsanayoḥ	viśvāsanānām
Locative	viśvāsane	viśvāsanayoḥ	viśvāsaneṣu

Compound viśvāsana -

Adverb -viśvāsanam -viśvāsanāt