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: outdoor sport activity 
Words: dog, swim, hike, hiking, fish

SOLUTION: dog

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

SOLUTION: dump truck

PROBLEM: Category: military rank 
Words: colonel, lieutenant, fighter, basic, general

SOLUTION:
basic