Fosilist or Fossilist: How To spell?
The word Fosilist is misspelled against Fossilist, a noun meaning "One who is versed in the science of fossils; a paleontologist."
Fossilist has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings fo & ilist which should not be misspelled with single 'S'
Wrong Spelling:  fo-s-ilist  Correct Spelling:  fo-ss-ilist 
Find more incorrect spellings of Fossilist to spell right way.