An articulation disorder is characterized by a child having difficulty producing specific types of sounds, and as a result produces sound substitutions, omissions, or distortions. Depending on the severity of the articulation disorder, the child’s speech intelligibility may be significantly reduced.
A phonological disorder is related to the linguistic aspects of language – a group of sounds with similar patterns (leaving out word endings or a sequence of consonants).
A child may have both articulation and phonological difficulties.