sizable vs hefty

sizable and hefty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sizable	No	Yes	No	No
hefty	No	Yes	No	No

As adjectives, sizable and hefty are synonyms defined as:

Other synonyms of sizable include goodish, goodly, healthy, respectable, sizeable, tidy.

sizable (adjective)	hefty (adjective)
large in amount or extent or degree	large in amount or extent or degree
fairly large in size	of considerable weight and size
	(of a person) possessing physical strength and weight; rugged and powerful