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.

Category: social gathering 
Words: place, club, outing, lettuce, group
lettuce

Category: aesthetic characteristic 
Words: 70, variety, color, fair, light
70

Category: guitar part 
Words: strap lock, output cord, emotional supports, fret, neck

emotional supports