TASK DEFINITION: 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.
PROBLEM: Category: emotional status 
Words: fret, truss rod, emotional upsets, sad, worried

SOLUTION: truss rod

PROBLEM: Category: physical property 
Words: large, obese, fat, chunky, fiber

SOLUTION: fiber

PROBLEM: Category: construction 
Words: hoist, crane, excavator, egret, derrick

SOLUTION:
egret