Thiler or Thiller: How To spell?
The word Thiler is misspelled against Thiller, a noun meaning "The horse which goes between the thills, or shafts, and supports them; also, the last horse in a team; -- called also thill horse."
Thiller has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings thi & er which should not be misspelled with single 'L'
Wrong Spelling:  thi-l-er  Correct Spelling:  thi-ll-er 
Find more wrongly spelled words of Thiller to spell it well.