Which term refers to sounds added to the beginning or end of a root or base word to make another word?

• A. Idioms
• B. Glossary
• C. Appendix
• D. Affixes

Answer: (D)

Affixes are sounds added to the beginning or end of a root word to form another word. They come in two main kinds: prefixes at the front and suffixes at the end. Adding prefixes or suffixes can change the meaning or the part of speech of the word, such as turning "happy" into "unhappy" with the prefix un-, or turning "talk" into "talking" or "talked" with suffixes that show tense or ongoing action. This word-building system expands vocabulary by creating new words from a base.

Other options describe different things: idioms are fixed phrases with meanings not inferred from the individual words; a glossary is a list of terms with definitions; an appendix is extra material added at the end of a book.