Final answer:
Expressive language refers to the ability to convey a message, while receptive language refers to the ability to understand what is being communicated.
Step-by-step explanation:
The ability to convey a message is referred to as expressive language, and the ability to understand what is being communicated is referred to as receptive language. Expressive language involves using words or other means to convey information, while receptive language involves understanding and interpreting the message being communicated.