Twiner or Twinner: How To spell?
The word Twiner is misspelled against Twinner, a noun meaning "One who gives birth to twins; a breeder of twins."
Twinner has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings twi & er which should not be misspelled with single 'N'
Wrong Spelling:  twi-n-er  Correct Spelling:  twi-nn-er 
Find more wrongly spelled words of Twinner to spell it well.