Apart from the fact that aphasia and apraxia are caused by brain damage, both are two different conditions. Aphasia is usually described as a language disorder which causes a partial or loss of language skills in patients. This is usually experienced when the damage affects the left hemisphere of the brain.
This occurs mostly to people whose language production and comprehension is in the left hemisphere of the brain. Aphasia has other causes such as brain tumor, migraine, epilepsy, Alzheimer’s and Parkinson’s disease. People that suffer from this condition will not be able to speak or write whatever they are willing to say. They will also find it difficult to understand what other people are saying.
Apraxia, on the other hand, is a disorder of motor planning caused when there is damage in the cerebrum. People suffering from this condition won't be able to perform coordinated movements. Depending on the type of apraxia being experienced, patients may not be able to coordinate their mouths whenever they want to speak.