* Prefixes and suffixes are both considered word parts. They are added to the beginning (prefix) or end (suffix) of a word to modify its meaning or grammatical function.
Let's break down the other options:
* Noun: A noun is a word that names a person, place, thing, or idea. Prefixes and suffixes can be attached to nouns, but they are not nouns themselves.
* Synonym: A synonym is a word that has the same or nearly the same meaning as another word. Prefixes and suffixes don't have synonyms, as they are not words on their own.
* Word part: This is the most accurate description of prefixes and suffixes. They are not complete words, but rather components that contribute to the meaning of a word.
Example:
* "un-" is a prefix that means "not." It can be added to the word "happy" to create the word "unhappy."
Therefore, the word part "un-" is a prefix, not a noun, synonym, or a complete word itself.