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: animal 
Words: flutter, swim, ant, fly, bats
answer:
flutter


question:
Category: emotional status 
Words: truss rod, emotional supports, emotional upsets, emotionalities, fret
answer:
truss rod


question:
Category: bird 
Words: excavator, parrot, swift, flamingo, crane
answer:

excavator