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.

Category: accomodation 
Words: mansion, mountain, flat, house, duplex
mountain

Category: physical activity 
Words: dog, push, duck, squat, jog
dog

Category: emotional status 
Words: amp, concerned, nervous, fret, emotional upsets

amp