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: flaxen, fair, sunny, cool, pale

A: sunny
****
Q: firm, tough, solid, hard, streamline

A: streamline
****
Q: fly, bats, eagle, walk, bird

A:
walk
****