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.

[Q]: Category: geographical property 
Words: mountain, flat, hill, mansion, plain
[A]: mansion


[Q]: Category: guitar part 
Words: neck, strap lock, fret, angry, notes
[A]: angry


[Q]: Category: direction 
Words: south, downward, flat, down, emotional state
[A]:
emotional state