Threty or Thretty: How To spell?

The word Threty is misspelled against Thretty, an adjective meaning "Thirty."

Thretty has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings thre & y which should not be misspelled with single 'T'
Wrong Spelling: thre-t-y
Correct Spelling: thre-tt-y
Explore spell check of Thretty to spell without errors.