Spilway or Spillway: How To spell?
The word Spilway is misspelled against Spillway, a noun meaning "A sluiceway or passage for superfluous water in a reservoir, to prevent too great pressure on the dam."
Spillway has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings spi & way which should not be misspelled with single 'L'
Wrong Spelling:  spi-l-way  Correct Spelling:  spi-ll-way 
Find more wrongly spelled words of Spillway to spell it well.