Declension table of ?āpa

Masculine	Singular	Dual	Plural
Nominative	āpaḥ	āpau	āpāḥ
Vocative	āpa	āpau	āpāḥ
Accusative	āpam	āpau	āpān
Instrumental	āpena	āpābhyām	āpaiḥ āpebhiḥ
Dative	āpāya	āpābhyām	āpebhyaḥ
Ablative	āpāt	āpābhyām	āpebhyaḥ
Genitive	āpasya	āpayoḥ	āpānām
Locative	āpe	āpayoḥ	āpeṣu

Compound āpa -

Adverb -āpam -āpāt