instruction:
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.
question:
Category: bird 
Words: neck, tackle, derrick, crane, steam roller
answer:
steam roller


question:
Category: nutritional value 
Words: iron, heavy, vitamin c, fat, brittleness
answer:
brittleness


question:
Category: kitchenware 
Words: glass, cup, knifer, coating, colander
answer:

coating