I need a plugin built for Microsoft WORD that I can call for use

I need a plugin for MS WORD. I need the plugin to, when I choose to use it, analyze particular groupings of words and flag them. There are two scenarios in particular: 1) The plugin should identify any first introduction of a word be referenced with the letter "a" or the word "an." (i.e., "a device," "a remote control," "a sensor," "an alert," etc.) 2) The plugin should identify all future use of the words, after they were introduced, as being referenced with the word "the." (i.e., "the device," "the remote control," "the sensor," "the alert," etc.). The plugin should be able to spot when there are issues with either of the above steps. So, for example, if my first use of the term "device" is, "the device," then this should be flagged because the first instance should be "a device." Likewise, if I already said "a device" once, then a second use of "a device" should be flagged because it should have been "the device."