Sevens and Sevener

Sevens noun - A card game in which you play your sevens and other cards in sequence in the same suit as the sevens; you win if you are the first to use all your cards.

Sevener is a synonym for sevens. In some cases you can use "Sevener" instead a noun "Sevens".

Sevener noun - The cardinal number that is the sum of six and one.

Sevens is a synonym for sevener. Sometimes you can replace term "Sevens" with "Sevener", this nouns are similar.