Wiktionary
nonmatch
n. That which is not a match; a mismatch.
Usage examples of "nonmatch".
She had interviewed for her job with Senator Marshall in a Towson State University sweatshirt and nonmatching Army sweatpants.
Standard operating procedure when two ships with nonmatched hatches docked up.
Any nonmatches we should check in case they are originals, uncatalogued.
They found several more nonmatches, then stopped for the evening meal.
Forell checked their growing list of nonmatches against larger university databases on what he called the Internet, and found them.