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: location (proximity) 
Words: beside, closest, close, adjacent, shut
shut

Category: corporate 
Words: solid, sustainability, streamline, firm, private
solid

Category: shady activities 
Words: fix, chocolate cake, fudge, lie, smuggled

chocolate cake