Nielist or Niellist: How To spell?

The word Nielist is misspelled against Niellist, a noun meaning "One who practices the style of ornamentation called niello."

Niellist has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings nie & ist which should not be misspelled with single 'L'
Wrong Spelling:  nie-l-ist 
Correct Spelling:  nie-ll-ist 
Find more wrongly spelled words of Niellist to spell it well.