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: social gathering 
Words: club, group, meeting, grilled cheese, convention
grilled cheese

Category: type of sandwich 
Words: dagwood, club, doorstep, hamburger, community
community

Category: employment activity 
Words: fire, recruit, ban, praise, blaze

blaze