Aramaic possesses, besides the ordinary (active) participles, certain additional forms of a similar meaning, mainly appearing in substantival use and commonly called nomina agentis. As far as the so-called derived stems of the verb are concerned, these nomina agentis are formed from the participle of each verbal stem through the addition of the ending-ān. In the basic stem of the verb, the ordinary participle of which has the form qātil (qātel), the nomen agentis appears as qātōl.