Thuny or Thunny: How To spell?
The word Thuny is misspelled against Thunny, a noun meaning "The tunny."
Thunny has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings thu & y which should not be misspelled with single 'N'
Wrong Spelling:  thu-n-y  Correct Spelling:  thu-nn-y 
Check more misspelled words of Thunny to spell it correct.