aporia /a-pōˈri-a or -pöˈ/

1. A professed doubt of what to say or to choose (rhetoric)
2. A difficulty

• airsick
• air-sickness
• airside
• air sign
• air signs
• airspace
• airspaces
• airspeed
• airspeeds
• air-splint
• air-splints
• air station
• air stations
• airstop
• airstops
• airstream
• airstream mechanism
• airstreams
• air strike
• air strikes
• airstrip
• airstrips
• air support
• air supports
• airt