Does the entire lexicon fit into memory or do you need to sort them on disk?
It most probably does. Word lists and dictionaries have at most a few hundreds of thousands of entries, and that's quite small compared to computer memory nowadays, probably even on Raspberry PI nanocomputers.
On your edit: yes, I agree that AWK is a great tool that I have used quite a lot in the past, but, personally, I have almost stopped using AWK when I started to know Perl well enough to make it a more powerful and more flexible replacement.
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