Answer: uniquer

AnswerCrossword Clue
uniquerbeing the only one sole his unique concern was his own comfort I can't walk away with a unique copy. Suppose I lost it? Kingsley Amis the unique factorization of a number into prime factors
uniquering without a like or equal unequaled could stare at the flames, each one new, violent, unique Robert Coover
uniquerusual a very unique ball-point pen we were fairly unique, the sixty of us, in that there wasn't one good mixer in the bunch J. D. Salinger