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: guitar part 
Words: frustrated, amp, string, fret, headstock

SOLUTION: frustrated

PROBLEM: Category: bird 
Words: dump truck, pelican, goose, crane, derrick

SOLUTION: dump truck

PROBLEM: Category: emotional display 
Words: follow, expression, colt, pester, fawn

SOLUTION:
colt