Editing the built-in autocorrect dictionary in AOSP keyboard I'd like to remove some words from the built-in dictionaries* in my AOSP keyboard (Cyanogenmod 11), to avoid autocorrect from suggesting/applying them.

Is there a dictionary file that can be edited to remove such words?

I suspect it might require root do be able to change it, but I don't mind if it does.

Note: I'm not talking about words added to my personal dictionary, which can be erased using the appropriate interface. I'd like to remove, for instance, the word Said from the French dictionary, which often appears when I mistype sais (a quite common French word). I never intend to use Said, but since it is already in the built-in dictionary, there is no standard way to simply delete it, AFAIK.

* Including languages other than English.
This other SE answer might be of help if your phone is running under CyanogenMod. That answer, in turn, points to this article where author shows the location of built-in dictionaries on the phone filesystem, as well as the location of built-in dictionary source files in Android open source project.

The rationale (all to be tried) should be grab the source of a builtin dictionary you want to edit, modify that, generate a new APK file out of that, and finally substitute the original dictionary APK with the custom APK.