noun
hero
HEER-oh/ˈhɪrəʊ/
A person held up for admiration because of notable qualities or deeds.
The firefighter is a hero as she guides a man outside.

Etymology
Greek hērōs referred to a demigod and also to warriors. English broadened the idea from superhuman strength or courage to exceptional human bravery, leading to the wider sense of someone admired for remarkable deeds or qualities.
In context
By the end of the conflict, now holding the rank of admiral, he was celebrated in Britain as a war hero. Admired both for his naval service and his personal charisma.
More examples
- My grandmother is my hero because she never gives up.
- The town honors the volunteers as local heroes.
- Young scientists often name her as one of their heroes.