"gap" - key terms from Wikipedia

achievement gap
air gap
anion gap
band gap
big stone gap
bridging the gap
buffalo gap
coverage gap
cumberland gap
deals gap
deep gap
delaware water gap
duration gap
emigrant gap
encke gap
energy gap
fiscal gap
fort indiantown gap
fulda gap
gap
gap	analysis
gap	band
gap	between
gap	fillers
gap	genes
gap	junction
gap	junctions
gap	penalty
gap	wedge
gembloux gap
gender gap
gender pay gap
indirect band gap
keeler gap
mass gap
mind the gap
missile gap
mole gap
pay gap
pennington gap
pine gap
rockfish gap
rossville gap
runcorn gap
spark gap
union gap
wage gap
water gap
watford gap
wind gap