(By Hedvig Skirgård): "An agent nominalization derives from a verb and functions like a noun or noun phrase. The result denotes the agent of an action. In English, we can exemplify this with the productive -er suffix (bak-er, fish-er, garden-er, etc.). This feature targets phonologically bound overt nominalizers, including affixes, clitics, tonal markers, reduplication, ablaut, etc. This derivation pattern needs to be productive. Compounds of a verb root and a noun meaning 'person' are likely not agent nominalizations."