Than ks Sally for taking a look at this one.
All I can tell you is that it is in a quiz I am trying to do and the instructions say "Please underline the odd one out and say what links those that remain. All the others have seemed to have a logical answer example: bowline, hitch, plant reef, slip. (all knots except plant)
So here are the options again , really have no inkling where to start on this one
8 i, 4c, 8p, 12m, 10w