As a quick check:
- flounce, flouncing, flounced are all found by dictionary lookup
- scrutinise and scrutinised are, but scrutinising isn't (that's how we spell it down under)
- scrutinize and scrutinized are, but scrutinizing isn't
- spell and spelling are both found
My general experience agrees with that. Mostly, I find the word, but some of the modified versions are missing. I tend to think this is a problem with the dictionary, rather than the search engine. But, as I don't have access to the actual word list, I can't check.
And, as stated earlier in the thread, the dictionary the Kindle uses is generally accepted to be better than the dictionary that Kobo uses. If the dictionary is important to you, then a Kindle is the way to go.
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