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: ocean 
Words: flow, current, course, moon, dastards

SOLUTION: dastards

PROBLEM: Category: animal 
Words: train, fly, jump, leap, grasshopper

SOLUTION: train

PROBLEM: Category: shady activities 
Words: unwarranted, fudge, falsehood, truffles, wrongful

SOLUTION:
truffles