Declension table of ?āpa

Neuter	Singular	Dual	Plural
Nominative	āpam	āpe	āpāni
Vocative	āpa	āpe	āpāni
Accusative	āpam	āpe	āpāni
Instrumental	āpena	āpābhyām	āpaiḥ
Dative	āpāya	āpābhyām	āpebhyaḥ
Ablative	āpāt	āpābhyām	āpebhyaḥ
Genitive	āpasya	āpayoḥ	āpānām
Locative	āpe	āpayoḥ	āpeṣu

Compound āpa -

Adverb -āpam -āpāt