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: secretary duty 
Words: errands, schedule appointments, image, make coffee, file
[A]: image


[Q]: Category: corporate 
Words: leverage, solid, firm, amalgamated, concerted
[A]: solid


[Q]: Category: geographical property 
Words: horizontal, flat, hill, round, elevation
[A]:
round