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: season 
Words: winter, roll, spring, hiems, fall
roll

Category: construction 
Words: digger, concrete pourer, crane, derrick, excavator
derrick

Category: kitchenware 
Words: knifer, knive, metal, glass, plate

metal

