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: fret, worried, chord, notes, headstock

SOLUTION: worried

PROBLEM: Category: outdoor sport activity 
Words: swim, wrestle, fish, canyoning, horse

SOLUTION: horse

PROBLEM: Category: store status 
Words: finished for the day, steady, locked, close, nearer

SOLUTION:
nearer