Revenue potential is more related to what the Hub is about/the title. There isn't, to my knowledge, any tool that would tell you what words you may be lacking; but, again I don't think the issue is figuring out specific words your Hub may be lacking. If the Hub is pretty is brief adding more of your own words (whichever ones you think may add something to the information you offer) may be worth a shot.
I took a quick look at your profile, and an example of what may (I think) make a Hub have more potential might be "How to Start Your Own Cookie Business" (I know it would be a completely Hub than what you have, but that kind of title may be more something more people would seek out in searches. Or something like, "The history of the cookie".
Something to consider (but don't take my word for this - really - just maybe consider it, or try it with a second version of your Hub (or something like that) might be (for the Hub on Americans and cookies) trying a title like, "Cookie sales in the US" or "The Popularity of Cookies in America". The difference (whether you tried another title or not) would be aiming to have a kind of general title that, if someone were searching, they'd run into in that search). (Or even something like, "Independent Cookie Bakers - Vincent's Cookies").