Click on the Related Link at the bottom for Communication disorders.
They are called a human being. But they are classified as Mute. A mute is when someone cant talk/speak. But they can still communicate.
Autistic is a possible term for a person who can not speak or communicate. Autism is when the person finds it hard to communicate and express themselves. They can't explain things properly when they talk and other people find it very hard to understand what they are trying to convey. The difficulty level differs between autistic people.
A good general term for people who can not speak or communicate is socially impaired. Also, communicationally challenged can be used.
Someone who cannot read or write is called illiterate.
On time
If someone is unable to speak, it's called being 'dumb'.
Dyscalculia! ;)
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Speechless
Hand capped
Mute
You call them 'mute'.
Hysterical.
There is no word for this, but it's common occurrence in language acquisition.
Someone who cannot hear or speak is often referred to as deaf-mute. However, it's important to note that this term is considered outdated and may be offensive to some individuals. It is more accurate and respectful to describe someone based on their specific condition, such as deaf or nonverbal.
quiet
mute
You call them illiterate.
Such a person is called bilingual.
Alligators cannot speak, but humans call young alligators "hatchlings".
ventriloquist
A person that can not speak is called mute. A person that can not hear is called deaf. There is no term yet that encompasses both.