Movement Vocabulary is the number of moves available at one's disposal for physical expression. Good alignment, posture, flexibility, balance, coordination, agility, grace, strength and timing all help to increase movement vocabulary. You could compare the moves in a person's body language to the vocabulary of words in written verbal language. But being an extortionist alone doesn't necessarily make you a good mover, or a physically intelligent person. Several more factors play a role in the "grammar" of body language to make someone a physically intelligent person. These include a sense of:
Location, Direction and Relationship
Tempo, Rhythm and Timing
Flow and Dynamics