heft vs ponderousness

heft and ponderousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
heft	Yes	No	Yes	No
ponderousness	Yes	No	No	No

As nouns, heft and ponderousness are synonyms defined as:

Other synonyms of heft include heftiness, massiveness, ponderosity.

heft (noun)	ponderousness (noun)
the property of being large in mass	the property of being large in mass
	an oppressive quality that is laborious and solemn and lacks grace or fluency

heft (verb)	ponderousness (verb)
lift or elevate
test the weight of something by lifting it