I'm developing a software application for children and it would be useful to have an English dictionary with terms/words sorted by their "interestingness" to children aged 4-8.
Terms like "unicorn", "bunny", "cat", "dog" would be on top and terms like "differential equations" and "econometrics" would be at the bottom (or not present).
Any ideas on where to find such a list?
Are there any open source / free children's encyclopedia's or books available from which such a list could be generated?