Declension table of arka

Masculine	Singular	Dual	Plural
Nominative	arkaḥ	arkau	arkāḥ
Vocative	arka	arkau	arkāḥ
Accusative	arkam	arkau	arkān
Instrumental	arkeṇa	arkābhyām	arkaiḥ arkebhiḥ
Dative	arkāya	arkābhyām	arkebhyaḥ
Ablative	arkāt	arkābhyām	arkebhyaḥ
Genitive	arkasya	arkayoḥ	arkāṇām
Locative	arke	arkayoḥ	arkeṣu

Compound arka -

Adverb -arkam -arkāt