Shouting is simply speaking loudly or making a loud sound. If you saw your friend some distance away at a crowded park, you might shout her name to get her attention. A soccer coach might shout instructions to the players on the field. Shouting can be angry, joyful, or neutral.
When you scream, you make a long, loud, high-pitched sound. People usually scream in moments of fear or pain. It is often a reflex action (screaming when something frightens you) but you can also scream intentionally. A parent whose small child starts to wander out into the street might scream for him to stop. People who are trapped in a car after an accident might scream for help.
Lob shots are balls hit high over the net in an upside down U shape. Because it takes longer for these balls to reach the other side of the net, lob shots can be useful for buying time.
Make sure to hit the ball deep into the court when lobbing. If you hit the ball short, the other team can easily attack the ball with a hard overhead volley.