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: deck, gunwale, queen, lifeline, bridge
queen

Category: animal 
Words: jog, jump, fish, fly, bats
jog

Category: corporate 
Words: combined, unbending, streamline, united, firm

unbending