Morphologie – Morphology:
The study of words and how they are formed. For example: verb conjugation, grammatical number, and when nouns, adjectives, and articles are changed according to the case.
Mutismus – Mutism:
A communication disorder resulting in an inability to speak. This includes individuals who are normally capable of speech but are unable to speak in specific situations.
Myofunktionelle Störung – Orofacial myofunctional disorder:
A muscle disorder of the mouth and face which affects muscle tone and tension due to motor, sensory, and/or skeletal abnormalities.
Quelle: "Leitfaden Sprache Sprechen Stimme Schlucken" von J.Siegmüller und H.Bartels / Urban&Fischer Verlag.