The Pronunciation Poem

Here is some pronunciation.
Ration never rhymes with nation,
Say prefer, but preferable,
Comfortable and vegetable.
B must not be heard in doubt,
Debt and dumb both leave it out.
In the words psychology,
Psychic, and psychiatry,
You must never sound the p.
Psychiatrist you call the man
Who cures the complex, if he can.
In architect, chi is k.
In arch it is the other way.