Doublon or Doubloon: How To spell?
The word Doublon is misspelled against Doubloon, an adjective meaning "A Spanish gold coin, no longer issued, varying in value at different times from over fifteen dollars to about five. See Doblon in Sup."
Doubloon has double "oo" is mispronounced as "o"Remember double 'OO' in between the strings doubl & n which should not be misspelled with single 'O'
Wrong Spelling:  doubl-o-n  Correct Spelling:  doubl-oo-n 
Check more misspelled words of Doubloon to spell it correct.