ぶん, ふん, ぶ
The fins that fell onto my sword were sliced into two parts.
Now that you've cut the fish, it's time to cut something else into parts. Next on your list is the buns (ぶん) which need to be split up amongst the people. If you'd like to learn the second reading, just think about how fun (ふん) it will be to do this task.
Currently there are no similar looking kanji which exist in the WaniKani learning system