Terms for public speaking:

 The degree of sound intensity or audibility; loudness

• Volume

• Tone

• Audibility

• Rate

 A particular quality, way of sounding, modulation, or intonation of the voice as expressive of some meaning, feeling, spirit, etc…

• Tone

• Volume

• Speech

• Clarity

something that is to be expressed through some medium, as speech, writing, or any of various arts

• Content

• Delivery

• Enunciate

• Structure

 Degree of speed, progress, etc…

Vocal or bodily behavior during the presentation of a speech

Clearness or lucidity as to perception or understanding

• Clarity

• Delivery

• Emphasis

• Enunciate

 Special and significant stress of voice laid on a particular word or syllable

• Emphasis

• Enunciate

• Structure

• Articulation

The group of spectators at a public event; listeners or viewers collectively, as in attendance at a theater or concert

• Audience

• Organization

• Feedback

• Sender

to utter or pronounce (words, sentences, etc.), especially in an articulate or a particular manner:

• Enunciate

• Emphasis

• Clarity

• Structure

 The adjustments and movements of speech organs involved in pronouncing a particular sound