Declension table of ?yakṣakūpa

Masculine	Singular	Dual	Plural
Nominative	yakṣakūpaḥ	yakṣakūpau	yakṣakūpāḥ
Vocative	yakṣakūpa	yakṣakūpau	yakṣakūpāḥ
Accusative	yakṣakūpam	yakṣakūpau	yakṣakūpān
Instrumental	yakṣakūpeṇa	yakṣakūpābhyām	yakṣakūpaiḥ yakṣakūpebhiḥ
Dative	yakṣakūpāya	yakṣakūpābhyām	yakṣakūpebhyaḥ
Ablative	yakṣakūpāt	yakṣakūpābhyām	yakṣakūpebhyaḥ
Genitive	yakṣakūpasya	yakṣakūpayoḥ	yakṣakūpāṇām
Locative	yakṣakūpe	yakṣakūpayoḥ	yakṣakūpeṣu

Compound yakṣakūpa -

Adverb -yakṣakūpam -yakṣakūpāt