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: consumer product 
Words: fearful, content, merchandise, shop, program

SOLUTION: fearful

PROBLEM: Category: type of sandwich 
Words: club, open-faced, convention, doorstep, roll

SOLUTION: convention

PROBLEM: Category: bird 
Words: crane, digger, pelican, swift, davit

SOLUTION:
digger