M.S. is an abbreviation for Master of Science, which is a graduate degree. Certified Speech and Language Pathologists have graduate degrees in Communication Disorders.
C.C.C. is an abbreviation for Certificate of Clinical Competence. Speech pathologists that have passed a national exam and did a clinical fellowship year with proper accreditation from the American Speech Language and Hearing Association will have those letters after their name.
S.L.P. is an abbreviation for Speech-Language Pathologist, a certification awarded by the Americah Speech-Language-Hearing Association (ASHA).
COM™ is an abbreviation for Certified Orofacial Myologist. Orofacial myology is a specialized professional discipline that evaluates and treats a variety of oral and facial (orofacial) muscle (myo-) postural and functional disorders and habit patterns.