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.

Q: sustainability, firm, amalgamated, combined, rigged

A: rigged
****
Q: motherboard, schedule appointments, schedule, file, type

A: motherboard
****
Q: fritter, whittle, divide, dunker, misuse

A:
dunker
****