Declension table of ?avapana

Neuter	Singular	Dual	Plural
Nominative	avapanam	avapane	avapanāni
Vocative	avapana	avapane	avapanāni
Accusative	avapanam	avapane	avapanāni
Instrumental	avapanena	avapanābhyām	avapanaiḥ
Dative	avapanāya	avapanābhyām	avapanebhyaḥ
Ablative	avapanāt	avapanābhyām	avapanebhyaḥ
Genitive	avapanasya	avapanayoḥ	avapanānām
Locative	avapane	avapanayoḥ	avapaneṣu

Compound avapana -

Adverb -avapanam -avapanāt