heavyweight

heavyweight /ˈhɛviˌweɪt/ noun
plural heavyweights
heavyweight
/ˈhɛviˌweɪt/
noun
plural heavyweights
Britannica Dictionary definition of HEAVYWEIGHT
[count]
1 
: a fighter in the heaviest class of boxers : a boxer who weighs more than 175 pounds (79.5 kilograms) — often used before another noun
2 
: someone or something that is very important and powerful
3 
: something that is heavy — often used before another noun