[noun] a conspicuous disparity or difference as between two figures; "gap between income and outgo"; "the spread between lending and borrowing costs" Synonyms:spread
[noun] an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall" Synonyms:opening
[noun] a narrow opening; "he opened the window a crack" Synonyms:crack