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: format, sort mail, make coffee, order office supplies, file

A: format
****
Q: ounce, foot, kilometer, milimeter, heel

A: heel
****
Q: pounce, car, bats, fly, grasshopper

A:
car
****