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: aesthetic characteristic 
Words: well, milky, variety, tone, fair

SOLUTION: well

PROBLEM: Category: construction 
Words: digger, concrete pourer, crane, derrick, excavator

SOLUTION: derrick

PROBLEM: Category: emotional status 
Words: ok, happy, calm, fine, suspension

SOLUTION:
suspension