The word Harponing is misspelled against Harpooning, which is present continuous of "Harpoon"
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Harpooning has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings harp & ning which should not be misspelled with single 'O'
Wrong Spelling:  harp-o-ning 
Correct Spelling:  harp-oo-ning 
Find more incorrect spellings of Harpooning to spell right way.