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.
Example: excavator, crane, pelican, hoist, upraise
Example solution: pelican
Example explanation: The common category here are words related to construction. A pelican is not related to construction because it is a type of bird.

Problem: disappointed, file, content, food, shop

Solution: disappointed