The women would probably talk more about the home and family. The men would probably talk about the state, war, and those violent type things.
We expect the most frequently used words by House to reflect the values of the specific house in question. For example, we believe that the most frequently used word for House Lannister will be related to finances and wealth, and their family sigil, the Lion. Additionally, within the hypothesis stated above, we believe that certain pronouns such as 'I' will be used more frequently in certain houses (like House Lannister, since the general consensus of GoT readers and watchers is that they are the 'evil' and 'narcissistic' House).
We expect that the results by region will be very similar to the results by house. The houses are grouped together in the story the way they are because of the ways the regions are divided.
We believe that the data will show that female characters are more prone to using adjectives than male characters, if George R.R. Martin's writing and depiction of his characters coincides with societal gender ideals, women in the book will be more descriptive in their speech, as they are in real life (on average). Males will probably be more inclined toward using verbs. Noun usage will probably be similar between the genders. We assume that the results for this would prove similar to parts of speech due to the increased "buffer" words that women use, and the more straightforward nature of the men's sentences.
For this particular analysis we believe that the most frequently part of speech used by House and Region will result in the same data. Part of this reasoning is due to the fact that the larger houses (Stark, Lannister, Baratheon, Targaryen, etc.) are the majority speakers. The sentence structure should reflect the parts of speech.