Words ending in '-mb' and '-bt' have a silent 'b', those ending in '-stle(r)' a silent 't', and those beginning in 'pn-', 'ps-' and 'pt-' a silent 'p'.
At the beginning or end of a word, 'g' is silent before 'm' and 'n'.
At the beginning of a word, 'k' is silent before 'n'.
At the end of a word, 'n' is silent after 'm'.
'w' is silent before 'r' at the beginning of a word, and in 'sword' and 'answer'.
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