TASK DEFINITION: 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.
PROBLEM: Category: boats 
Words: check, stern, hull, galley, deck

SOLUTION: check

PROBLEM: Category: type of sandwich 
Words: roll, hoagie, bacon, club, community

SOLUTION: community

PROBLEM: Category: ocean 
Words: current, prompt, drink, jetstream, tide

SOLUTION:
prompt