The Kindle has the best dictionaries by a considerable margin. The Kobo also has good commercial dictionaries, although not as good as those of the Kindle. Devices such a Pocketbook can only use user-supplied dictionaries which tend to be more "word lists", and certainly aren't up to the standard of either Kindle or Kobo.
Perhaps worth noting, too, that you can buy additional dictionaries in the Kindle Store and add them to the device. I don't believe it's possible to add additional dictionaries to the Kobo (is it?).
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