truancy (n.)

• absence
• absenteeism
• clock-watching
• cut
• default
• departure
• disappearance
• dodging
• ducking
• escape
• furlough
• holiday
• hooky
• leave
• leaving
• malingering
• nonappearance
• nonattendance
• shirking
• skulking
• slacking
• soldiering
• vacation