Efervesce or Effervesce: How To spell?
The word Efervesce is misspelled against Effervesce, a verb meaning "To be in a state of natural ebullition; to bubble and hiss, as fermenting liquors, or any fluid, when some part escapes in a gaseous form."
Effervesce has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings E & ervesce which should not be misspelled with single 'F'
Wrong Spelling:  E-f-ervesce  Correct Spelling:  E-ff-ervesce 
Explore spell check of Effervesce to spell without errors.