Quilback or Quillback: How To spell?

The word Quilback is misspelled against Quillback, a noun meaning "An American fresh-water fish (Ictiobus, / Carpiodes, cyprinus); -- called also carp sucker, sailfish, spearfish, and skimback."

Quillback has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings qui & back which should not be misspelled with single 'L'
Wrong Spelling:  qui-l-back 
Correct Spelling:  qui-ll-back 
Check more misspelled words of Quillback to spell it correct.