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: window material 
Words: metal, handle, dish, glass, vinyl
dish

Category: measurement unit 
Words: meter, inch, foot, heel, pound
heel

Category: animals 
Words: geese, crouch, duck, elephant, mallet

crouch

