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: moral characteristic 
Words: concise, frank, matter of fact, pork, blunt
pork

Category: ocean 
Words: signal, timely, brine, flow, current
timely

Category: bird 
Words: winch, crane, swallow, winch, davit

winch