Declension table of ?viśvaka

Neuter	Singular	Dual	Plural
Nominative	viśvakam	viśvake	viśvakāni
Vocative	viśvaka	viśvake	viśvakāni
Accusative	viśvakam	viśvake	viśvakāni
Instrumental	viśvakena	viśvakābhyām	viśvakaiḥ
Dative	viśvakāya	viśvakābhyām	viśvakebhyaḥ
Ablative	viśvakāt	viśvakābhyām	viśvakebhyaḥ
Genitive	viśvakasya	viśvakayoḥ	viśvakānām
Locative	viśvake	viśvakayoḥ	viśvakeṣu

Compound viśvaka -

Adverb -viśvakam -viśvakāt