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.

[EX Q]: angular momentum, fat, calcium, brittleness, ugly
[EX A]: calcium

[EX Q]: valley, house, cabin, squashed, flat
[EX A]: valley

[EX Q]: file, answer calls, prepare, download, answer
[EX A]:
download