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: animal 
Words: flutter, fly, bats, eagle, pounce

SOLUTION: flutter

PROBLEM: Category: guitar part 
Words: fret, worried, chord, notes, headstock

SOLUTION: worried

PROBLEM: Category: weather 
Words: make the grade, deal, sunny, ghostly, fair

SOLUTION:
ghostly