TASK DEFINITION: Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.
PROBLEM: motherboard, schedule appointments, schedule, file, type

SOLUTION: motherboard

PROBLEM: fret, notes, emotional state, bored, emotional upsets

SOLUTION: notes

PROBLEM: hummingbird, excavator, heron, winch, crane

SOLUTION:
excavator