Do any of the talk tools identify unknown words in comments?
How are misspelled words and coded speech addressed?
Can I add to these lists by pasting a list?
We have various lists of common spellings and misspellings for these words/phrases, and each newsroom can add to it as they wish. Also we have the Toxic Comments plugin for more esoteric phrasing: https://blog.coralproject.net/toxic-avenging/
We don't do anything with "unknown" words - they might be names, typos, other languages, or just new words in common usage. They're too frequent for us to mark.