* -logy: This suffix indicates the study or science of something. So, "speech" could become "speechology", although it's not a commonly used term.
* -ics: Similar to "-logy," "-ics" also indicates a field of study or a system of knowledge. So, "speech" could become "speechics", again not a common term.
* -ism: This suffix is used to denote a particular doctrine, theory, or practice. You could have "speechism" referring to a specific philosophy or approach to speech.
However, in most cases, you wouldn't need a suffix to refer to speech. Instead, you would use the word itself or phrases like:
* The act of speech
* The science of speech
* The art of speech
The best choice depends on the specific context and what you want to emphasize.