You're the one who can't use words properly. A "gap" is a generic term, an "airtight gap" is a type of "gap." You're quibbling about words, you're on the wrong

You're the one who can't use words properly. A "gap" is a generic term, an "airtight gap" is a type of "gap." You're quibbling about words, you're on the wrong side of the quibble, and on top of all that, you're not even dealing with the main point I brought up. Please tell me you're not a programmer.