IPA: //ˈpɛn.tə.θliːt//
KK: /ˈpɛntəˌθlit/
A person who competes in a pentathlon, which is a sporting event that includes five different events, typically running, swimming, fencing, equestrian show jumping, and pistol shooting.
The pentathlete trained hard to improve her performance in all five events.
Pentathlete → It is formed from "penta-" (from Greek "pente", meaning five) and "athletes" (from Greek "athlētēs", meaning one who competes for a prize). The word "pentathlete" refers to an athlete who competes in five different events.
Think of the prefix 'penta-' meaning five, and remember that a pentathlete is someone who competes in five different athletic events.
No commonly confused words.