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: bird 
Words: hummingbird, tackle, crane, hoist, tackle

SOLUTION: tackle

PROBLEM: Category: aesthetic characteristic 
Words: well, milky, variety, tone, fair

SOLUTION: well

PROBLEM: Category: physical activity 
Words: duck, geese, get down, bend, push

SOLUTION:
geese