Let's break down the provided words to identify whether they are prefixes, suffixes, or root words:
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ist - This is a suffix, commonly used to denote someone who practices or is concerned with something (e.g., artist, scientist).
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uni - This is a prefix meaning "one" or "single" (e.g., uniform, unicycle).
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ive - This is a suffix often used to form adjectives indicating a tendency or capability (e.g., active, creative).
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arch - This can function as a root word meaning "chief" or "principal," as seen in words like "archenemy" or "archangel."
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auto - This is a prefix meaning "self" (e.g., automobile, autobiography).
In summary:
- ist: Suffix
- uni: Prefix
- ive: Suffix
- arch: Root word
- auto: Prefix