The puzzle is to find pairs of English words (A,B) such that A and B are both synonyms and anagrams of each other.
For example, theater and theatre (which are the British and American spelling of the same word), and note and tone which mean both the same in music and are also anagrams of each other
To avoid making this too broad and to avoid trivial examples like (theater, theatre), let's define the score of the pair to be the number of places where the letters of the words differ. For example, for (theater, theatre) the score is 2, since the last letter differs (r versus e) and the next to last letter also differs (e versus r). For (note, tone), the score is also 2, since the first letter differs (n versus t) and the third also (t versus n). You're looking with the pair of words with the highest possible score.
Note: This question is inspired by Words that are anagrams of themselves by user stib.