Declension table of ?śaṅkāśaṅku

Masculine	Singular	Dual	Plural
Nominative	śaṅkāśaṅkuḥ	śaṅkāśaṅkū	śaṅkāśaṅkavaḥ
Vocative	śaṅkāśaṅko	śaṅkāśaṅkū	śaṅkāśaṅkavaḥ
Accusative	śaṅkāśaṅkum	śaṅkāśaṅkū	śaṅkāśaṅkūn
Instrumental	śaṅkāśaṅkunā	śaṅkāśaṅkubhyām	śaṅkāśaṅkubhiḥ
Dative	śaṅkāśaṅkave	śaṅkāśaṅkubhyām	śaṅkāśaṅkubhyaḥ
Ablative	śaṅkāśaṅkoḥ	śaṅkāśaṅkubhyām	śaṅkāśaṅkubhyaḥ
Genitive	śaṅkāśaṅkoḥ	śaṅkāśaṅkvoḥ	śaṅkāśaṅkūnām
Locative	śaṅkāśaṅkau	śaṅkāśaṅkvoḥ	śaṅkāśaṅkuṣu

Compound śaṅkāśaṅku -

Adverb -śaṅkāśaṅku