Underseter or Undersetter: How To spell?
The word Underseter is misspelled against Undersetter, a noun meaning "One who, or that which, undersets or supports; a prop; a support; a pedestal."
Undersetter has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings underse & er which should not be misspelled with single 'T'
Wrong Spelling:  underse-t-er  Correct Spelling:  underse-tt-er 
Explore spell check of Undersetter to spell without errors.