Declension table of ?siddhaka

Masculine	Singular	Dual	Plural
Nominative	siddhakaḥ	siddhakau	siddhakāḥ
Vocative	siddhaka	siddhakau	siddhakāḥ
Accusative	siddhakam	siddhakau	siddhakān
Instrumental	siddhakena	siddhakābhyām	siddhakaiḥ siddhakebhiḥ
Dative	siddhakāya	siddhakābhyām	siddhakebhyaḥ
Ablative	siddhakāt	siddhakābhyām	siddhakebhyaḥ
Genitive	siddhakasya	siddhakayoḥ	siddhakānām
Locative	siddhake	siddhakayoḥ	siddhakeṣu

Compound siddhaka -

Adverb -siddhakam -siddhakāt