Tething or Teething: How To spell?
The word Tething is misspelled against Teething, a noun meaning "The process of the first growth of teeth, or the phenomena attending their issue through the gums; dentition."
Teething has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings T & thing which should not be misspelled with single 'E'
Wrong Spelling:  T-e-thing  Correct Spelling:  T-ee-thing 
Find more wrongly spelled words of Teething to spell it well.