Biterweed or Bitterweed: How To spell?
The word Biterweed is misspelled against Bitterweed, a noun meaning "A species of Ambrosia (A. artemisiaefolia); Roman worm wood."
Bitterweed has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings bi & erweed which should not be misspelled with single 'T'
Wrong Spelling:  bi-t-erweed  Correct Spelling:  bi-tt-erweed 
Find more wrongly spelled words of Bitterweed to spell it well.