--> Annihilable has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings a & ihilable which should not be misspelled with single 'N'
Wrong Spelling:  a-n-ihilable 
Correct Spelling:  a-nn-ihilable 
Find more wrongly spelled words of Annihilable to spell it well.