instruction:
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.
question:
Category: military rank 
Words: sargent, ordinary, captain, colonel, general
answer:
ordinary


question:
Category: ocean 
Words: up to the moment, tide, current, jetstream, brine
answer:
up to the moment


question:
Category: mode of transportation 
Words: spider, wave, train, walk, fly
answer:

spider