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: construction 
Words: excavator, steam roller, concrete pourer, swallow, crane
answer:
swallow


question:
Category: emotional status 
Words: fret, emotional supports, output cord, angry, concerned
answer:
output cord


question:
Category: corporate 
Words: united, firm, leverage, streamline, taut
answer:

taut