Squirm
Part of speech: verb
Definition: To twist one's body with snakelike motions. To twist in discomfort, especially from shame or embarrassment. To evade (a question, an interviewer etc).
Wriggle
Part of speech: verb
Definition: To slightly twist one's body and quickly move one's limbs.To cause to or make something wriggle.
Part of speech: noun
Definition: A wriggling movement.