In summary
A taxonomy is a classification of words. Taxonomies are extremely useful in the analysis of raw unpredictable text. When analyzing raw text, the raw text is read and each word in the raw text is used for a search of the applicable taxonomies.
Taxonomies can be divided into two classes: generic and specific. A generic taxonomy is a classification of words that are applicable to any subject and a specific taxonomy is a classification of words that are unique to an industry. Taxonomies can be found in multiple languages and exist at different levels. An n level taxonomy is a taxonomy whose depth of classification goes down an indeterminate number of levels.