agentaffix
An agent affix is a derivational morpheme that marks the semantic role of the agent—the doer of an action—in a word. It is used to form words that designate a person or entity that performs an activity described by a verb or a verbal base. Agent affixes may appear as suffixes, prefixes, or, in some languages, infixes, and their use is governed by the phonology and morphology of the language.
In many languages, agent affixes derive agent nouns from verbs or related bases. They can be productive
Examples of agent affixes across languages show diverse strategies. English commonly uses suffixes such as -er
Some languages also use affixes with nuanced meanings or combine them with other morphemes to indicate aspects