Diglotism or Diglottism: How To spell?
The word Diglotism is misspelled against Diglottism, a noun meaning "Bilingualism."
Diglottism has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings diglo & ism which should not be misspelled with single 'T'
Wrong Spelling:  diglo-t-ism  Correct Spelling:  diglo-tt-ism 
Find more incorrect spellings of Diglottism to spell right way.