A word of one type (usually a noun) is reduced to form another word of a different type (usually a verb) is called,

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A word of one type (usually a noun) is reduced to form another word of a different type (usually a verb) is called

AConversion

BBackformation

CBlending

DDerivation

Answer:

Backformation occurs when a word of one type (usually a noun) is reduced to form a word of a different type, typically a verb.
For example, the noun "editor" becomes the verb "edit," or the noun "action" becomes the verb "act."