1. Fearlessness:
* Suffix: -ness (indicates a state or quality)
* Prefix: None
2. Requirement:
* Suffix: -ment (indicates a state, result, or action)
* Prefix: None
3. Extremely:
* Prefix: extrem- (meaning "very" or "to the greatest degree")
* Suffix: -ly (indicates an adverb, modifying an adjective or another adverb)
4. Reconsider:
* Prefix: re- (meaning "again" or "back")
* Suffix: -er (indicates a person who performs an action)
In summary:
* Fearlessness and Requirement have suffixes only.
* Extremely has both a prefix and a suffix.
* Reconsider has a prefix only.