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: outdoor sport activity 
Words: kayak, raft, fish, canyoning, dolphin

SOLUTION: dolphin

PROBLEM: Category: emotional status 
Words: annoyed, content, fine, detached, bright

SOLUTION:
bright