Final answer:
Aphasia is the term for the inability to speak, which includes both expressive aphasia for production of language and receptive aphasia for understanding language.
Step-by-step explanation:
The word that means inability to speak is aphasia. Aphasia is a condition that affects the ability to communicate, which can include the inability to speak, to understand spoken language, or to read and write. Expressive aphasia, also known as Broca's aphasia, is the loss of the ability to produce language, while receptive aphasia, or Wernicke's aphasia, involves the loss of the ability to understand received language. Both conditions are associated with damage to specific areas in the left hemisphere of the brain.