Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

[EX Q]: concerned, strap lock, anxious, bored, fret
[EX A]: strap lock

[EX Q]: bored, amp, board, fret, truss rod
[EX A]: bored

[EX Q]: submarine, group, club, roll, grilled cheese
[EX A]:
group