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: ashamed, down, emotional upsets, disgusted, ground

A: ground
****
Q: level, smooth, flat, lined, elevation

A: level
****
Q: trap, dolphin, fish, goat, cat

A:
trap
****