Declension table of ?kartva

Neuter	Singular	Dual	Plural
Nominative	kartvam	kartve	kartvāni
Vocative	kartva	kartve	kartvāni
Accusative	kartvam	kartve	kartvāni
Instrumental	kartvena	kartvābhyām	kartvaiḥ
Dative	kartvāya	kartvābhyām	kartvebhyaḥ
Ablative	kartvāt	kartvābhyām	kartvebhyaḥ
Genitive	kartvasya	kartvayoḥ	kartvānām
Locative	kartve	kartvayoḥ	kartveṣu

Compound kartva -

Adverb -kartvam -kartvāt