Declension table of ?amastaka

Neuter	Singular	Dual	Plural
Nominative	amastakam	amastake	amastakāni
Vocative	amastaka	amastake	amastakāni
Accusative	amastakam	amastake	amastakāni
Instrumental	amastakena	amastakābhyām	amastakaiḥ
Dative	amastakāya	amastakābhyām	amastakebhyaḥ
Ablative	amastakāt	amastakābhyām	amastakebhyaḥ
Genitive	amastakasya	amastakayoḥ	amastakānām
Locative	amastake	amastakayoḥ	amastakeṣu

Compound amastaka -

Adverb -amastakam -amastakāt