bash spell check

[spursfan]

I am producing a program in bash which analyses a mailbox (.mbx) file. One of
the outputs which i want it to be able to complete is to count how many
times specified words appear in the file, however they are spelt. i.e
spelling mistakes or other symbols used to replace letter, for e.g @ or 4
instead of A. I have originally done it to take in account different
sysmbols etc although it does not account for spelling mistakes and wondered
if there was a more efficient way in which it could be done?
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