heavyweight vs giant

heavyweight and giant both are nouns.

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

As nouns, heavyweight and giant are synonyms defined as:

heavyweight and giant: a person of exceptional importance and reputation

Other synonyms of heavyweight include behemoth, colossus, titan.

As nouns, heavyweight and giant are synonyms defined as:

heavyweight and giant: a very large person; impressive in size or qualities

Other synonyms of heavyweight include hulk, whale.

heavyweight (noun)	giant (noun)
A weight class division in combat sports, often the heaviest.	any creature of exceptional size
a person of exceptional importance and reputation	an unusually large enterprise
a professional boxer who weighs more than 190 pounds	a very bright star of large diameter and low density (relative to the Sun)
a wrestler who weighs more than 214 pounds	someone that is abnormally large and powerful
a very large person; impressive in size or qualities	a person of exceptional importance and reputation
an amateur boxer who weighs no more than 201 pounds	an imaginary figure of superhuman size and strength; appears in folklore and fairy tales
	a very large person; impressive in size or qualities

heavyweight (adjective)	giant (adjective)
	of great mass; huge and bulky