principal sum vs corpus

principal sum and corpus both are nouns.

Word	Noun	Adjective	Verb	Adverb
principal sum	Yes	No	No	No
corpus	Yes	No	No	No

As nouns, principal sum and corpus are synonyms defined as:

principal sum and corpus: capital as contrasted with the income derived from it

Other synonyms of principal sum include principal.

principal sum (noun)	corpus (noun)
capital as contrasted with the income derived from it	the main part of an organ or other bodily structure
	a collection of writings
	capital as contrasted with the income derived from it