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: truss rod, fret, neck, bored, strap lock

SOLUTION: bored

PROBLEM: Category: measurement unit 
Words: meter, inch, foot, heel, pound

SOLUTION: heel

PROBLEM: Category: emotional status 
Words: bright, happy, relaxed, fine, well

SOLUTION:
bright