Binary and Doubleheader

Binary adjective - Consisting of two members or parts that are usually joined.

Doubleheader and binary are semantically related In some cases you can use "Doubleheader" instead an adjective "Binary".

Doubleheader noun - Two games instead of one (especially in baseball when the same two teams play two games on the same day).

Binary and doubleheader are semantically related in two-fold topic. You can use "Binary" instead an adjective "Doubleheader".