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: boats 
Words: deck, gunwale, queen, lifeline, bridge

SOLUTION: queen

PROBLEM: Category: bird 
Words: neck, tackle, derrick, crane, steam roller

SOLUTION: steam roller

PROBLEM: Category: construction 
Words: hoist, excavator, crane, derrick, tackle

SOLUTION:
hoist