Heptad
Part of speech: noun
Definition: a group of seven things
Septet
Part of speech: noun
Definition: A group of seven; often applied to a musical group of seven performers.
Heptad as a noun is a group of seven things while Septet as a noun is a group of seven; often applied to a musical group of seven performers.
Part of speech: noun
Definition: a group of seven things
Part of speech: noun
Definition: A group of seven; often applied to a musical group of seven performers.
We hope you now know whether to use Heptad or Septet in your sentence.