colossus vs heavyweight

colossus and heavyweight both are nouns.

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

As nouns, colossus and heavyweight are synonyms defined as:

colossus and heavyweight: a person of exceptional importance and reputation

Other synonyms of colossus include behemoth, giant, titan.

colossus (noun)	heavyweight (noun)
someone that is abnormally large and powerful	A weight class division in combat sports, often the heaviest.
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