Biternut or Bitternut: How To spell?
The word Biternut is misspelled against Bitternut, a noun meaning "The swamp hickory (Carya amara). Its thin-shelled nuts are bitter."
Bitternut has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings bi & ernut which should not be misspelled with single 'T'
Wrong Spelling:  bi-t-ernut  Correct Spelling:  bi-tt-ernut 
Check more misspelled words of Bitternut to spell it correct.