Declension table of ?siddhikara

Neuter	Singular	Dual	Plural
Nominative	siddhikaram	siddhikare	siddhikarāṇi
Vocative	siddhikara	siddhikare	siddhikarāṇi
Accusative	siddhikaram	siddhikare	siddhikarāṇi
Instrumental	siddhikareṇa	siddhikarābhyām	siddhikaraiḥ
Dative	siddhikarāya	siddhikarābhyām	siddhikarebhyaḥ
Ablative	siddhikarāt	siddhikarābhyām	siddhikarebhyaḥ
Genitive	siddhikarasya	siddhikarayoḥ	siddhikarāṇām
Locative	siddhikare	siddhikarayoḥ	siddhikareṣu

Compound siddhikara -

Adverb -siddhikaram -siddhikarāt