Other forms: pairings
A pairing is a match between two things or people, like the perfect pairing of chocolate and peanut butter.
Use this noun for two folks who work together as a perfect unit, like the pairing of your baseball team's pitcher and catcher, or two things that seem made for each other, like the classic pairing of grilled cheese and tomato soup. You can also describe the act of sorting people into pairs this way: "Our family's secret Santa pairing meant that I had to buy a gift for my great uncle again."