Any entrepreneur can make commercial use of general knowledge.
What's relevant here is whether the Neil's Wacky Wiki Word Cloud is a copyrighted work, and if so, who owns the copyright.
If Neil owns the copyright, he can give it away or post it to Commons under a more restrictive license.
If I am reading
this page correctly, CC-by-NC is one of the supported licensing options on Wikimedia's Creative Commons. All Neil has to do is to select that licensing option, and he is good to go.