A speech disorder involving difficulties in articulating specific types of sounds. Articulation disorders often involve substitution of one sound for another, slurring of speech, or indistinct speech.

Children who have a delay in pragmatic language have difficulty understanding how to use language when more than one person (the child) is involved.

Since a large portion of our social communication doesn’t involve actual talking, pragmatic language encompasses both verbal and nonverbal rules that dictate social interactions.

Receptive language means the ability to understand information. It involves understanding the words, sentences, and meaning of what others say or what is read.

Expressive language means being able to put thoughts into words and sentences, in a way that makes sense and is grammatically accurate.

(https://www.afasic.org.uk/about-talking/more-about-speech-language-and-communication/)