Difference between Decathlon and Pentathlon

What is the difference between Decathlon and Pentathlon?

Decathlon as a noun is an athletic contest consisting of ten events which includes sprinting, hurdling, jumping, and throwing over a span of two days while Pentathlon as a noun is an ancient athletics discipline, featuring five events: stadion, wrestling, long jump, javelin and discus

We hope you now know whether to use Decathlon or Pentathlon in your sentence.