Build a word plugin for analyzing a sentence

Wanting to build a cross-platform Word add-in using the JavaScript API to identify a set of numbered sentences in a particular section in a Word document and analyze those sentences by pulling out the "noun phrases" and checking which noun phrases commonly exist in the marked sentences. For the common noun phrases build a "tree" showing which numbered sentences include that noun phrase. Here, "noun phrase" would refer to the noun itself and any adjectives and article of speech. So, "first ball" and "second ball" would be two different "noun phrases" for the purpose of the tree. The noun phrases in the tree would also be checked to determine if the first noun phrase had an "a" article and all subsequent noun phrases had a "the" article. The tree would then highlight in red anytime that rule is broken (such as by a subsequent use of the noun phrase re-using "a" or the appearance of a "the" with a noun phrase that had not yet been used).