Declension table of ?vapuna

Neuter	Singular	Dual	Plural
Nominative	vapunam	vapune	vapunāni
Vocative	vapuna	vapune	vapunāni
Accusative	vapunam	vapune	vapunāni
Instrumental	vapunena	vapunābhyām	vapunaiḥ
Dative	vapunāya	vapunābhyām	vapunebhyaḥ
Ablative	vapunāt	vapunābhyām	vapunebhyaḥ
Genitive	vapunasya	vapunayoḥ	vapunānām
Locative	vapune	vapunayoḥ	vapuneṣu

Compound vapuna -

Adverb -vapunam -vapunāt