"gap" - key terms from Wikipedia

achievement gap
air gap
anion gap
band gap
bridging the gap
buffalo gap
coverage gap
cumberland gap
delaware water gap
duration gap
encke gap
energy gap
explanatory gap
fulda gap
gap
gap	analysis
gap	band
gap	between
gap	coverage
gap	filler
gap	insurance
gap	junction
gap	junction plaques
gap	penalty
gap	scheme
gap	wedge
gap	year
gender wage gap
giuk gap
high anion gap
iq gap
keeler gap
kirkwood gap
magnetic gap
mind the gap
minute gap
missile gap
newfound gap
one gap
pine gap
protruding gap	fillers
rossville gap
runcorn gap
spark gap
spark gap	transmitter
two gap
union gap
wage gap
water gap
watford gap