multiple similar rows, where only one field has changed
Plan A:  Use SELECT DISTINCT word FROM ... when pulling out.  That is, eliminate dups when fetching.

Plan B:  Have a SET datatype to list 3,6,7.

Plan C:  Use an extra many:many table to map "imposter" to each of the 3 levels.  There would be 3 rows for that word in the new table, but only one row in the current table.

Plan C may be the "proper" way to do it.