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: accomodation 
Words: apartment, cabin, squashed, smooth, flat

SOLUTION: smooth

PROBLEM: Category: guitar part 
Words: inlays, concerned, string, notes, fret

SOLUTION: concerned

PROBLEM: Category: geographical property 
Words: valley, even, flat, paved, mountain

SOLUTION:
paved