A person who claims to communicate with the dead is often referred to as a "medium." Mediums are believed to have the ability to connect with spirits or the souls of deceased individuals, typically during séances or spiritual sessions. They may also be called psychic mediums or spiritualists, depending on their specific practices and beliefs.
a medium
A person who does not speak is called mute or nonverbal.
mute
quiet
You call them 'mute'.
A person who can speak two languages is called a bilingual.
a bum
If you want to call her do it when you feel comfortable but it is always best to speak in person.
Mortician.
If someone is unable to speak, it's called being 'dumb'.
Hysterical.
no you dont