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the claim
The English suffix er functions as a derivational morpheme
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
2 sources for · 0 against

Linguistic research and morphological studies consistently classify the English suffix -er as a derivational morpheme used to form agentive and non-agentive nouns from verbs.

Evidence for · 2
Morphology, language and the brain: the decompositional substrate for language comprehension.
2007 · cited by 114
Paper [0] explicitly discusses derivationally complex forms like 'rider', involving the -er suffix, within morphological processing.
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The analysis

The claim is a standard linguistic fact that the suffix '-er' functions to derive new words (such as 'runner' or 'reader' from 'run' and 'read'), which is directly supported by morphological literature discussing deverbal nominalization.

More for · 1
Non-agentive Deverbal <i>-er</i> Nominalization in English and Dutch
1998 · cited by 4
Paper [6] investigates non-agentive deverbal -er nominals in English, confirming its function as a derivational suffix.
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 8804 Aug 2026
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