A better system-wide dictionary

in Mac Software edited January 2014
I'm looking for a system-wide dictionary that allows me to not only "learn" new words (I write fantasy, so I create a lot of non-English words) but also gives me the option to, at minimum, indicate how to make the word plural and possessive. Even better, it would allow me to mark the word as a noun, verb, etc. and indicate all possible variants on it. In Word or Pages, I always have to have the dictionary "learn" every variant of each word and even then, it sometimes tells me there's a grammar problem (e.g., Caađo is always green underlined in Pages with the suggestion CAAđo in its place).

Does anyone know of a dictionary that has that kind of power and runs under Lion? I'd even take a Pages-only dictionary with those features.
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