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: nervous, frustrated, fret, jack, concerned

SOLUTION: jack

PROBLEM: Category: aesthetic characteristic 
Words: fine, custody, level, beautiful, attractive

SOLUTION: custody

PROBLEM: Category: construction 
Words: digger, upraise, parrot, crane, hoist

SOLUTION:
parrot