IEP - individualized educational program. This document is created by the IEP committee (parent, classroom teacher, speech therapist, special education teacher, official school representative, student, etc). The IEP contains your child's individual speech, language, and academic goals. It also lists any modifications your child will be receiving within the regular classroom setting.
articulation disorder - difficulty in producing speech sounds correctly; sounds may be omitted ("pay" for "play"), distorted ("ship" for "sip"), or substituted ("wock" for "rock").

phonological disorder - multiple errors that can be grouped on some principle or characteristic and thus form patterns that severely affect intelligibility.

language impairment - difficulty in learning to comprehend (receptive) and/or produce language (expressive)
fluency disorder - speech disorders characterized by excessive dysfluencies or excessive duration of dysfluencies or both.

stuttering - speech that is produced with excessive amounts of struggle and effort. Any break in the flow of speech may sound like stuttering. These breaks may be described as part or whole word repetitions (e.g. bu-bu-butter); phrase repetitions (e.g. what is the...what is the...what is the answer?); sound prolongations (fff-flower); or any form of struggling behavior associated with the production of speech.

cluttering - speech that is characterized by excessively fast rate, indistinct articulation, and possibly language formulation problems

voice disorder - various disorders of communication related to faulty, abnormal, or inappropriate loudness, pitch, quality, and resonance

Sources: Hegde's PocketGuide to Treatment in Speech-Language Pathology, 2nd edition

                Hegde's PocketGuide to Assessment in Speech-Language Pathology, 2nd edition