Areas of Language Development
First, it’s important to understand that there is a distinction between speech and language. Speech is the physical articulation and expression of language. Language is more comprehensive, as it includes receiving and understanding verbal communication, as well as expressing it appropriately. 
Second, these are the three main areas of speech and language development:
1. Receptive: the ability to hear and understand speech and the nuances of language
2. Expressive: the ability to speak and enunciate clearly and correctly, as well as use language appropriately.
3. Pragmatic: the ability to discriminate and use language correctly based on the social setting—includes understanding and incorporating correct emotion, tone, reasoning, facial/body gestures
Children may exhibit a developmental delay in language in one or more of these areas. In addition, some children, particularly those with autism, may have apraxia or dyspraxia. Apraxia indicates the inability to speak; dyspraxia indicates a limited ability to speak.