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: employment activity 
Words: fire, remove, praise, inferno, replace
inferno

Category: location (proximity) 
Words: near, close, gated, bordering, on top of
gated

Category: outdoor sport activity 
Words: tiger, climbing, kayak, fish, wrestle

tiger