Which suffix would you use to describe a condition related to speech?

The suffix that accurately describes a condition related to speech is -phasia. This suffix derives from the Greek word "phasia," meaning "speech" or "to speak." In medical terminology, it is often used in terms related to speaking disorders, such as "aphasia," which refers to a loss of ability to understand or express speech, typically due to brain damage.

The other suffixes provided each have distinct meanings unrelated to speech. For instance, -scope refers to an instrument used for viewing or examining, -pathy denotes a disease or disorder, and -stomy refers to the creation of an opening or mouth, typically related to surgical procedures. Therefore, -phasia is the most appropriate choice for describing conditions specifically associated with speech.