TASK DEFINITION: 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.
PROBLEM: close, nearest, touching, on top of, barred

SOLUTION: barred

PROBLEM: crane, pelican, egret, hummingbird, upraise

SOLUTION: upraise

PROBLEM: pelican, excavator, derrick, tackle, crane

SOLUTION:
pelican