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: measurement unit 
Words: ounce, ear, inch, foot, milimeter
ear

Category: physical activity 
Words: trip, jump, fall, equinox, exercise
equinox

Category: alcoholic drinks 
Words: wine, go fish, gin, tonic, tequila

go fish