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: geographical property 
Words: horizontal, hotel, flat, lined, smooth

SOLUTION: hotel

PROBLEM: Category: emotional status 
Words: kind, down, sad, backward, emotionalities

SOLUTION: backward

PROBLEM: Category: aesthetic characteristic 
Words: dull, handsome, hot, fine, alert

SOLUTION:
alert