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: boats 
Words: crew, deck, rudder, suits, hull
suits

Category: bird 
Words: dump truck, pelican, goose, crane, derrick
dump truck

Category: boxing terminology 
Words: chips, corner, tko, apron, deck

chips