Cluttering, a speech and fluency disorder characterized primarily by a rapid rate of speech, which makes speech difficult to understand. Developmental verbal dyspraxia also known as childhood apraxia of speech. Dysarthria is a weakness or paralysis of speech muscles caused by damage to the nerves or brain. Dysarthria is often caused by strokes, Parkinsons disease, ALS, head or neck injuries, surgical accident, or cerebral palsy. Aphasia
Dysprosody is an extremely rare neurological speech disorder. It is characterized by alterations in intensity, in the timing of utterance segments, and in rhythm, cadence, and intonation of words. The changes to the duration, the fundamental frequency, and the intensity of tonic and atonic syllables of the sentences spoken, deprive an individuals particular speech of its characteristics. The cause of dysprosody is usually associated with neurological pathologies such as brain vascular accidents, cranioencephalic traumatisms, and brain tumors. Muteness is the complete inability to speak. Speech sound disorders involve difficulty in producing specific speech sounds (most often certain consonants, such as /s/ or /r/), and are subdivided into articulation disorders (also called phonetic disorders) and phonemic disorders. Articulation disorders are characterized by difficulty learning to produce sounds physically. Phonemic disorders are characterized by difficulty in learning the sound distinctions of a language, so that one sound may be used in place of many. However, it is not uncommon for a single person to have a mixed speech sound disorder with both phonemic and phonetic components. Stuttering (AKA “Dysphemia”)  affects approximately 1% of the adult population.
The bullying can result in decreased self-esteem. Language disorders
Language disorders are usually considered distinct from speech disorders, although they are often used synonymously. Speech disorders refer to problems in producing the sounds of speech or with the quality of voice, where language disorders are usually an impairment of either understanding words or being able to use words and do not have to do with speech production. See also
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