The root oper, meaning 'work,' appears in which word?

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Understanding word roots helps you decode meanings across related terms. The root oper means work, so a word built around operating or doing work will carry that root. In this case, operation has oper- plus the suffix -ation, turning it into a noun that describes the act or process of working. That aligns with the meaning of work and action.

The other options come from different roots: liberate uses liber- meaning free; luminous uses lumen- meaning light; script uses scrib- meaning write. So operation is the word that contains the working root.