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: melancholy, descending, emotionalities, emotional, down

A: descending
****
Q: duplex, studio, flat, paved, squashed

A: paved
****
Q: ecstatic, content, disappointed, sad, service

A:
service
****