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: fine, custody, level, beautiful, attractive

Answer: custody


Question: Category: geographical property 
Words: flat, horizontal, smooshed, elevation, house

Answer: house


Question: Category: mode of transportation 
Words: fly, grasshopper, bike, train, glide

Answer:
grasshopper