Swelfish or Swellfish: How To spell?

The word Swelfish is misspelled against Swellfish, a noun meaning "Any plectognath fish that dilates itself, as the bur fish, puffer, or diodon."

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