derivational morphology
Definition - Another name for lexical morphology, the branch of morphology that studies word formation.

Example Usages -

1. “Languages may or may not have derivational morphology (to make words from other words, e.g. run > runner), or inflectional morphology for an obligatory set of syntactically consequential choices (e.g. plural the girls are vs. singular the girl is).”
(Source: The Myth of Language Universals: Language diversity and its importance for cognitive science (Nicholas Evans & Stephen Levinson) )

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