Declension table of karmakartṛ

Masculine	Singular	Dual	Plural
Nominative	karmakartā	karmakartārau	karmakartāraḥ
Vocative	karmakartaḥ	karmakartārau	karmakartāraḥ
Accusative	karmakartāram	karmakartārau	karmakartṝn
Instrumental	karmakartrā	karmakartṛbhyām	karmakartṛbhiḥ
Dative	karmakartre	karmakartṛbhyām	karmakartṛbhyaḥ
Ablative	karmakartuḥ	karmakartṛbhyām	karmakartṛbhyaḥ
Genitive	karmakartuḥ	karmakartroḥ	karmakartṝṇām
Locative	karmakartari	karmakartroḥ	karmakartṛṣu

Compound karmakartṛ -

Adverb -karmakartṛ