Doubleton and Twosome

Doubleton noun - (bridge) a pair of playing cards that are the only cards in their suit in the hand dealt to a player.

Twosome and doubleton are semantically related. In some cases you can use "Twosome" instead a noun "Doubleton".

Twosome noun - Two things of the same or similar kind that match or are considered together.

Doubleton and twosome are semantically related. Sometimes you can replace term "Doubleton" with "Twosome", this nouns are similar.