[Tutor] Find all strings that....

[Alexander Etter]

Hi. My friend gave me a good wake up exercise which I do not want you to solve for me: find all strings which can be converted to alpha with at most two operations, where alpha is some string constant, and a substring of at least length three of alpha must be in the answers. 
So, my question is: is there a library or .txt dictionary ( not the data type, rather the merriam webster kind ) I can use to test my script on? I'd imagine this library/dictionary to contain thousands of words. Not random words. 
Thanks for reading,
Alexander