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: aesthetic characteristic 
Words: fair, unprejudiced, level, tone, milky
unprejudiced

Category: bird 
Words: excavator, goose, pelican, swift, crane

excavator