Coroborative or Corroborative: How To spell?
The word Coroborative is misspelled against Corroborative, a noun meaning "A medicine that strengthens; a corroborant."
Corroborative has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings co & oborative which should not be misspelled with single 'R'
Wrong Spelling:  co-r-oborative  Correct Spelling:  co-rr-oborative 
Find more incorrect spellings of Corroborative to spell right way.