Filter out uncommon nouns

[tragram]

The noun list is generated using a word frequency list. There are some words, that fit both the noun and a different category. This leads to not common nouns being included, just because they are the same as a "different" common word. An example of this would be i.e. "mäkinen" - doubles as "hilly" and a very common surname (capital M, obviously), but which also technically means a small hill, which isn't a terribly common word, according to the Finns I asked. It therefore probably shouldn't be included in the TOP 1000 list of nouns.