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: physical property 
Words: sugars, obese, big boned, fat, pasty

SOLUTION: sugars

PROBLEM: Category: type of rigidity 
Words: solid, leverage, hard, unbending, firm

SOLUTION: leverage

PROBLEM: Category: bird 
Words: goose, excavator, sandpiper, mallet, crane

SOLUTION:
excavator