Declension table of ?siddhikāraka

Neuter	Singular	Dual	Plural
Nominative	siddhikārakam	siddhikārake	siddhikārakāṇi
Vocative	siddhikāraka	siddhikārake	siddhikārakāṇi
Accusative	siddhikārakam	siddhikārake	siddhikārakāṇi
Instrumental	siddhikārakeṇa	siddhikārakābhyām	siddhikārakaiḥ
Dative	siddhikārakāya	siddhikārakābhyām	siddhikārakebhyaḥ
Ablative	siddhikārakāt	siddhikārakābhyām	siddhikārakebhyaḥ
Genitive	siddhikārakasya	siddhikārakayoḥ	siddhikārakāṇām
Locative	siddhikārake	siddhikārakayoḥ	siddhikārakeṣu

Compound siddhikāraka -

Adverb -siddhikārakam -siddhikārakāt