A shot in the dark, but it "sounds" like a "frequency list":
http://en.wiktionary.org/wiki/Wiktionary:Frequency_lists
And it is likely to be a "pre-populated" one, used for auto-completion or autocorrect or spelling check (or similar).
However it would be rather easy to compare the files from two different devices and see if they match.
Cannot say (but it sounds like "personally added words" go *somewhere else*) if it can be changed by the user, but it is likely to be connected to these functions:
https://gigaom.com/2011/10/14/ios-5-how-to-add-words-to-the-auto-correct-dictionary/
jaclaz
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