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.

[EX Q]: Category: weather 
Words: even, tangle, mild, fair, 70
[EX A]: even

[EX Q]: Category: aesthetic characteristic 
Words: high quality, ok, level, classy, fine
[EX A]: ok

[EX Q]: Category: date status 
Words: delayed, history, up to the moment, current, flow
[EX A]:
flow