If you count the frequency of letters in a message, then have one axis with letters and another with numbers, is that a histogram or a bar graph or something different still?
When we scroll almost to the end of the ppt link in your "Here" hyperlink, the author discusses "Graphs that are not graphs", shows a chart with category versus numerical values, and calls this type a "bar diagram". So that's how you might call yours in general if you want.I vote for histogram. Here is a definition that does not contain the phrase "numerical data".
If you are looking for "publishable quality" then there are more significant things to address with your graphs (assuming the images are your final effort). Labels for all axes, graph title, color scheme, elimination of chartjunk to start.
Here is a nice presentation that seems generally relevant.