Voice -: How an actor uses their voice in their portrayal of a character. Relates to tone, pitch, pace, accent, intonation and other qualities of voice. Different uses of voice can be used to show and express different attitudes, emotions and objectives in characters.
Movement -: How an actor moves. This relates to how the might move through the space - how the walk/crawl/shuffle/roll etc.... It can also relate to how they "move" while static - are they still? Shaking etc. etc.... Movement can also relate to posture.
Gesture -: How they use their hands and other parts of their body when they are communicating. This relates to movement, but isn't quite the same thing. Gestures are often hand movements, but can involve the whole body.
Facial Expression -: How the actor uses their face to communicate meaning in the world of the play. Facial expression may match with voice and gesture - or it may contrast with it. It can be highly naturalistic or very non-naturalistic depending on what the impact desired.