* Deaf refers to a hearing impairment.
* Dumb is an outdated and offensive term that used to be used to describe someone who is unable to speak.
It's important to use respectful and accurate language when discussing disabilities.
Instead of "dumb," you could say:
* Mute (though this term is also considered outdated by some)
* Speech-impaired
* Nonverbal
Remember, the best way to refer to someone with a disability is to use the language they prefer.