Articulation skills- The production of speech sounds in words, sentences and connected speech. 
Receptive Language skills-  The understanding or comprehension of concepts, spoken information, oral directions, answering questions.
Expressive Language skills- Using language to communicate thoughts, knowledge and feelings effectively.
Pragmatic Language skills- Social conversational skills.
Fluency-The rhythm or flow of speech.
Voice-  The use of the vocal cords, looks at speech volume, pitch, hoarseness, breathiness, nasality.

Helpful Websites:
American Speech-Language-Hearing Association | ASHA