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

Category: ocean 
Words: current, early, water, brine, tide
early

Category: aesthetic characteristic 
Words: size, ghostly, fair, tangle, level

tangle