Trunion or Trunnion: How To spell?
The word Trunion is misspelled against Trunnion, a noun meaning "A cylindrical projection on each side of a piece, whether gun, mortar, or howitzer, serving to support it on the cheeks of the carriage. See Illust. of Cannon."
Trunnion has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings tru & ion which should not be misspelled with single 'N'
Wrong Spelling:  tru-n-ion  Correct Spelling:  tru-nn-ion 
Check more misspelled words of Trunnion to spell it correct.