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: type of rigidity 
Words: rigged, firm, unyielding, streamline, taut
answer:
streamline


question:
Category: animal 
Words: soar, cockroach, walk, fly, run
answer:
soar


question:
Category: location (proximity) 
Words: on top of, shut down, right there, adjacent, close
answer:

shut down