Derivational morphology

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Derivational morphology is the branch of the study of words that involves the changes in their forms which lead to the creation of new words or meanings, or sometimes their adaptation for use as a new word class. It is sometimes called word-building. It is a branch of etymology that deals with such changes as adding the suffix '-ment' to a verb to create a new noun, as in 'arrange' [verb] --> 'arrangement' [noun]; and adding the suffix '-ly' to convert an adjective into an adverb, as when the adjective 'strange' becomes the adverb 'strangely.

The study of how words change their form for such grammatical reasons as case, person and number is a branch of morphology known as inflectional morphology.