Rater or Ratter: How To spell?
The word Rater is misspelled against Ratter, a noun meaning "Anything which catches rats; esp., a dog trained to catch rats; a rat terrier. See Terrier."
Ratter has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings ra & er which should not be misspelled with single 'T'
Wrong Spelling:  ra-t-er  Correct Spelling:  ra-tt-er 
Explore spell check of Ratter to spell without errors.