Two major types of communication disorders are speech disorders and language disorders.
●Speech disorders include impairments of articulation, fluency, and/or voice.
•Articulation disorders are characterized by substitutions, omissions, additions, or distortions of speech sounds that interfere with intelligibility. Articulation disorders may be caused by hearing impairment, neurologic problems, apraxia, or structural defects.
•Fluency disorder (stuttering) is an interruption in the flow of speaking characterized by atypical rate, rhythm, and repetitions in sounds, syllables, words, and phrases.
•Voice disorder pertains to abnormal production of vocal quality, pitch, loudness, resonance, and/or duration that is inappropriate for the child’s age and sex. Voice disorders are related to misuse (excessive effort and force while speaking) or organic changes of the vocal mechanism.
interesting reads could also be found at the link below but is (Spanish) . happy reading!