The word Bilow is misspelled against Billow, a noun meaning "A great wave or flood of anything."
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Billow has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings bi & ow which should not be misspelled with single 'L'
Wrong Spelling:  bi-l-ow 
Correct Spelling:  bi-ll-ow 
Find more incorrect spellings of Billow to spell right way.