Function to determine word validity isn't true to Bananagrams


For the purpose of the project, it is necessary only to have a consistent function determine if a word can be used in a solution. However, the current implementation of that uses WordNet, which is quite nice and fast, but permits many words that wouldn't be allowed in a real Bananagrams game, such as proper nouns and acronyms. It may be possible to cut out proper nouns, but acronyms is more dubious.