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: apartment, round, valley, flat, even

A: valley
****
Q: hunting, goat, camp, trap, fish

A: goat
****
Q: group, club, toast, hamburger, doorstep

A:
group
****