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: moral characteristic 
Words: frank, concise, bun, matter of fact, fortitude
answer:
bun


question:
Category: military rank 
Words: ubiquitous, general, colonel, soldier, lieutenant
answer:

ubiquitous