Two different words for an opening in an object that can allow air to pass through.
Reveal top + bottom answer and reasoning
Answer: VENT HOLE
Top half: VENT - VENT is the first half of "vent hole", the top + bottom answer for the shared final clue: "Two different words for an opening in an object that can allow air to pass through."
Bottom half: HOLE - HOLE completes "vent hole", so the top and bottom rungs answer the shared final clue together: "Two different words for an opening in an object that can allow air to pass through."