Answer:
Ic
Step-by-step explanation:
The suffix you can add to the root word "phon" to create a word meaning "having characteristics of sound" is "ic."
The suffix "-ic" is often added to root words to form adjectives that describe something as having the characteristics of the root word. For example, if you add "-ic" to the root word "hydr," which means "water," you get the word "hydric," which means "having the characteristics of water."
So if you add "-ic" to the root word "phon," which means "sound," you get the word "phonic," which means "having characteristics of sound."
Here are some examples of other words formed with the suffix "-ic":
"electric" (from the root word "electr," which means "electricity")
"frenetic" (from the root word "fren," which means "madness")
"radic" (from the root word "rad," which means "root")
The suffixes "-ed," "-ment," and "-tion" can also be added to root words to create different types of words, but they do not create words that mean "having characteristics of" the root word.