Septenary and Sevens

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

Sevens is a synonym for septenary. In some cases you can replace term "Sevens" with "Septenary", this nouns are similar.

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.

Septenary is a synonym for sevens in seven of something topic. You can use "Septenary" instead the word "Sevens" as a noun or an adjective, if it concerns topics such as having seven of something.