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: construction 
Words: tackle, crane, digger, sandpiper, dump truck

SOLUTION: sandpiper

PROBLEM: Category: aesthetic characteristic 
Words: fair, flaxen, well, color, pale

SOLUTION: well

PROBLEM: Category: construction 
Words: derrick, concrete pourer, steam roller, derrick, crane

SOLUTION:
derrick