heavyset vs thickset

heavyset and thickset both are adjectives.

Word	Noun	Adjective	Verb	Adverb
heavyset	No	Yes	No	No
thickset	No	Yes	No	No

As adjectives, heavyset and thickset are synonyms defined as:

Other synonyms of heavyset include compact, stocky, thick.

heavyset (adjective)	thickset (adjective)
having a short and solid form or stature	planted or growing close together
	having a short and solid form or stature