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.

Let me give you an example: Category: construction 
Words: excavator, crane, pelican, hoist, upraise
The answer to this example can be: pelican
Here is why: A pelican is not related to construction because it is a type of bird.

OK. solve this:
Category: bird 
Words: crane, derrick, hoist, winch, parrot
Answer:
hoist