How large would an inverted word list be? It might work better to try to match against a join(' ', @wordlist) (computed only once, obviously). Unless your data is highly random, for a document of 20MB that string probably won't exceed a few dozen kbytes (if it's even that large). Upon finding a match, pos, index, rindex, substr would serve to extract the full word the match landed on, which you can then look up in your inverted word list.
Regex::PreSuf would be of use to increase the pattern efficiency if it's still an issue.
Makeshifts last the longest.
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