Airproof vs. Airtight: What's the Difference?

Airproof and Airtight Definitions
Airproof
Airtight
Airtight
Impermeable by air.
Airproof
(transitive) To make airtight.
Airtight
Having no weak points; sound
An airtight excuse.
Airtight
Impermeable to air or other gases.
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Airtight
(figuratively) Having no weak points or flaws.
We have an airtight argument they won’t be able to punch holes in.
Airtight
Highly reserved in some matter, particularly tight-lipped or tight-fisted.
Airtight
Having no weak points;
An airtight defense
An airtight argument
Airtight
Not allowing air or gas to pass in or out