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: food 
Words: provision, frank, hot dog, goodies, harsh
harsh

Category: geographical property 
Words: mountain, flat, hill, mansion, plain
mansion

Category: outdoor sport activity 
Words: horse, fish, hunt, swim, climbing

horse