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: bird 
Words: dump truck, pelican, goose, crane, derrick

SOLUTION: dump truck

PROBLEM: Category: card games 
Words: vodka, spider, gin, blackjack, go fish

SOLUTION:
vodka