absence without leave vs truant

absence without leave

• The military offense of not being present when expected without proper authority. 

truant

• One who is absent without permission, especially from school. 

• Wandering from business or duty; straying; loitering; idle, and shirking duty. 

• Absent without permission, especially from school. 

• To play truant. 

• To idle away; to waste. 

• To idle away time.