Threider or Threader: How To spell?
The word Threider is misspelled against Threader, a noun meaning "A device for assisting in threading a needle."
Threader has vowels 'ea' together mispronounced as 'ei'Word contains consecutive vowels 'EA' in between alphabets thr & der is misspelled as 'EI'
Wrong Spelling:  thr-ei-der  Correct Spelling:  thr-ea-der 
Find more wrongly spelled words of Threader to spell it well.