S: (n) motion, movement, move, motility (a change of position that does not entail a change of location) "the reflex motion of his eyebrows revealed his surprise"; "movement is a sign of life"; "an impatient move of his hand"; "gastrointestinal motility"
S: (n) change (the action of changing something) "the change of government had no impact on the economy"; "his change on abortion cost him the election"
S: (n) action (something done (usually as opposed to something said)) "there were stories of murders and other unnatural actions"
W: (v) shake [Related to: shaking] (move with or as if with a tremor) "his hands shook"
W: (adj) shaky [Related to: shakiness] (vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze) "a quaking bog"; "the quaking child asked for more"; "quivering leaves of a poplar tree"; "with shaking knees"; "seemed shaky on her feet"; "sparkling light from the shivering crystals of the chandelier"; "trembling hands"
W: (adj) shaky [Related to: shakiness] (inclined to shake as from weakness or defect) "a rickety table"; "a wobbly chair with shaky legs"; "the ladder felt a little wobbly"; "the bridge still stands though one of the arches is wonky"
W: (v) tremble [Related to: trembling] (move or jerk quickly and involuntarily up and down or sideways) "His hands were trembling when he signed the document"