Here are some terms you could use depending on the context:
* Non-verbal: This is a general term that describes people who communicate without using spoken language.
* Mute: This term is often used to describe people who cannot speak due to a physical disability. However, it can be considered offensive by some people.
* Speech-impaired: This term describes people who have difficulty speaking due to a physical or neurological condition.
* Deaf-mute: This term is outdated and should be avoided. It is offensive to use because not all deaf people are mute, and it implies that deafness and muteness are inseparable.
It's always best to ask someone how they prefer to be identified. You can use phrases like:
* "How do you prefer to communicate?"
* "Do you have a preferred way for me to interact with you?"
Ultimately, it is important to be respectful and mindful of individual preferences when referring to people who do not speak.