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.
--------
Question: Category: aesthetic characteristic 
Words: 70, pale, fair, light, milky

Answer: 70


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

Answer: spider


Question: Category: baby animals 
Words: woods, follow, buck, calf, fawn

Answer:
follow