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.
--------
Question: Category: secretary duty 
Words: errands, fax, file, type, ram

Answer: ram


Question: Category: aesthetic characteristic 
Words: fine, custody, level, beautiful, attractive

Answer: custody


Question: Category: outdoor sport activity 
Words: row, fish, wrestle, whale, raft

Answer:
whale