Semantics
This refers to the meaning of words. An SLP may work on expanding vocabulary, synonyms, antonyms, figurative language, and/or multiple meaning words.
Morphology
Morphology is the system of rules that govern changes in meaning at the word level. This includes prefixes, suffixes, plural forms, and verb tense markers.
Syntax
Syntax (or grammar) is how we put words together in order to form phrases and sentences. For example, in English we would say, “I went to a new school.” instead of “I school new went to.”
Pragmatics
Pragmatics are the social skills we use and understand when communicating with others. This includes gestures, body language, facial expressions, prosody or inflection, tone of voice, topic maintenance, and more.
Phonology
Phonology is the study of the sounds or phonemes in a language and the rules about how those sounds can combined. Phonemes are the smallest units of sound that make up a language. For example, the word “dig” contains three phonemes /d/ /ĭ/ /g/.
Source: www.asha.org