Ruderstock or Rudderstock: How To spell?
The word Ruderstock is misspelled against Rudderstock, a noun meaning "The main part or blade of the rudder, which is connected by hinges, or the like, with the sternpost of a vessel."
Rudderstock has double "dd" is mispronounced as "d"Remember double 'DD' in between the strings Ru & erstock which should not be misspelled with single 'D'
Wrong Spelling:  Ru-d-erstock  Correct Spelling:  Ru-dd-erstock 
Check more misspelled words of Rudderstock to spell it correct.