Speler or Speller: How To spell?

The word Speler is misspelled against Speller, a noun meaning "A spelling book."

Speller has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings spe & er which should not be misspelled with single 'L'
Wrong Spelling:  spe-l-er 
Correct Spelling:  spe-ll-er 
Explore spell check of Speller to spell without errors.