Disappearing Act

by Joseph DeVincentis

ANSWER: MODE

 

Words visible in each partial word search puzzle hint to the nature of the set of the removed, circled words. After filling in the circled spaces one word from each set will be left uncircled (marked in red below). As suggested in the flavortext, the letters of each uncircled entry that were initially visible (i.e their unchecked letters) are the important ones. They spell MEAN MEDIAN AND which clues the missing member of the set, MODE.