instruction:
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.
question:
Category: guitar part 
Words: frustrated, amp, string, fret, headstock
answer:
frustrated


question:
Category: ocean 
Words: current, early, water, brine, tide
answer:
early


question:
Category: social gathering 
Words: outing, discothek, club, group, bacon
answer:

bacon