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: physical activity 
Words: summer, roll, plummet, fall, exercise

SOLUTION: summer

PROBLEM: Category: construction 
Words: excavator, steam roller, concrete pourer, swallow, crane

SOLUTION: swallow

PROBLEM: Category: corporate 
Words: leverage, firm, corporation, concerted, unyielding

SOLUTION:
unyielding