Here’s the classification of each given word:
- arch - Prefix (often denotes chief or principal, as in "archenemy")
- ive - Suffix (used to form adjectives, indicating a tendency or quality, as in "creative")
- uni - Prefix (means one, as in "universe")
- ist - Suffix (used to indicate a person who practices or is concerned with something, as in "artist")
- auto - Prefix (means self, as in "autonomous")
So the classifications are:
- arch - Prefix
- ive - Suffix
- uni - Prefix
- ist - Suffix
- auto - Prefix