Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Category: animal 
Words: fish, bat, sea turtle, trap, goat
trap

Category: kitchenware 
Words: metal, glass, knifer, dish, cup
metal

Category: mode of transportation 
Words: car, wave, fly, drive, fish

fish