Part 1. 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.
Part 2. Example
Category: construction 
Words: excavator, crane, pelican, hoist, upraise
Answer: pelican
Explanation: A pelican is not related to construction because it is a type of bird.
Part 3. Exercise
Category: bird 
Words: parrot, digger, sandpiper, flamingo, crane
Answer:
digger