Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Category: mode of transportation 
Words: train, spider, wave, fly, drive
spider

Category: geographical property 
Words: paved, even, hill, level, flat
even

Category: season 
Words: cold, lift, autumn, fall, winter

lift