maturity date vs due date

maturity date and due date both are nouns.

Word	Noun	Adjective	Verb	Adverb
maturity date	Yes	No	No	No
due date	Yes	No	No	No

As nouns, maturity date and due date are synonyms defined as:

maturity date and due date: the date on which an obligation must be repaid

Other synonyms of maturity date include maturity.

maturity date (noun)	due date (noun)
the date on which an obligation must be repaid	the date on which an obligation must be repaid