Some words of the English language can cause certain difficulties when attempting to pronounce or spell them. The word is spelled one way and becomes, sound wise, quite different.
LIBRARY as it is spelled becomes LI BREE when spoken.
IMMEDIATELY becomes MEE JUT LY when spoken.
NECESSARY as spelled but becomes NE CESS REE when spoken.
PRONOUNCE to declare – is a verb and when heard it sounds as PRO NOWNS but the spelling of the adjective is spelled PRONUNCIATION and is heard as PRO NUN SEE A SHUN
PHLEGM spelled and when spoken becomes FLEM.