Examples of communication disorders:

• autism — a developmental defect that affects understanding of emotional communication
• aphasia — loss of the ability to produce or comprehend language
• Learning disability – Both speaking and listening components of the definition
• Dysnomia - Deficit involving word retrieval
• Asperger syndrome – Areas of social and pragmatic language
• Semantic Pragmatic Disorder – Challenges with the semantic and pragmatic aspects of language
• blindness – a defect of the eye or visual system
• deafness – a defect of the ear or auditory system
• dyslexia – a defect of the systems used in reading
• dyscalculia – a defect of the systems used in communicating numbers
• expressive language disorder — affects speaking and understanding where there is no delay in non-verbal intelligence.
• mixed receptive-expressive language disorder — affects speaking, understanding, reading and writing where there is no delay in non-verbal intelligence.
• speech disorders such as
• cluttering, a speech organization disorder
• stuttering
• oesophageal voice
• speech sound disorder
• specific language impairment
• dysarthria

source: wikipedia