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: weather 
Words: even, tangle, mild, fair, 70
even

Category: mode of transportation 
Words: bee, swim, fly, car, walk
bee

Category: emotional status 
Words: content, calm, fine, firstrate, ok

firstrate