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