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: crane, ostrich, davit, dump truck, pelican

A: dump truck
****
Q: fly, grasshopper, walk, waggle, train

A: train
****
Q: wave, spider, fly, flutter, bike

A:
spider
****