Declension table of ?laṅka

Masculine	Singular	Dual	Plural
Nominative	laṅkaḥ	laṅkau	laṅkāḥ
Vocative	laṅka	laṅkau	laṅkāḥ
Accusative	laṅkam	laṅkau	laṅkān
Instrumental	laṅkena	laṅkābhyām	laṅkaiḥ laṅkebhiḥ
Dative	laṅkāya	laṅkābhyām	laṅkebhyaḥ
Ablative	laṅkāt	laṅkābhyām	laṅkebhyaḥ
Genitive	laṅkasya	laṅkayoḥ	laṅkānām
Locative	laṅke	laṅkayoḥ	laṅkeṣu

Compound laṅka -

Adverb -laṅkam -laṅkāt