Data Matching Index for Business Classification System

I have a master table of 2800 unique business classifications and approximately 250,000 unique business classifications on another table. I would like back a consolidated table of the 250,000 mapped to the 2800 classifications. Basically we have around 2 million businesses in our database and each has been invited to clarify their main line of business activity (what they do). End result is that we have around 250,000 different business classifications. We've come up with a user friendly list of 2800 classifications and now want to align the 250,000 top to the most appropriate classification within the 2800 list.

Suggest: As the two tables are very different its going to take fuzzy string matching to match and then select the most appropriate and strongest confidence. Stage(1) would obvious be looking for an exact match between the two classification systems, then (2) a string search for the full classification match, then (3) Looking for all the words in file 2 within file (1) in the same order, then (4) all of the words in any order (5) several words in correct order (6) several words in any order (7) less words in correct order, (8) less words in any order (9) even less words in correct order (10) even less words in any order (11) single word

Thanks
Milton