heavyweight vs colossus

heavyweight and colossus both are nouns.

Word	Noun	Adjective	Verb	Adverb
heavyweight	Yes	No	No	No
colossus	Yes	No	No	No

As nouns, heavyweight and colossus are synonyms defined as:

heavyweight and colossus: a person of exceptional importance and reputation

Other synonyms of heavyweight include behemoth, giant, titan.

heavyweight (noun)	colossus (noun)
A weight class division in combat sports, often the heaviest.	someone that is abnormally large and powerful
a person of exceptional importance and reputation	a person of exceptional importance and reputation
a professional boxer who weighs more than 190 pounds
a wrestler who weighs more than 214 pounds
a very large person; impressive in size or qualities
an amateur boxer who weighs no more than 201 pounds