documentation vs substantiation

documentation and substantiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
documentation	Yes	No	No	No
substantiation	Yes	No	No	No

As nouns, substantiation is a hypernym of documentation; that is, substantiation is a word with a broader meaning than documentation:

documentation: documentary validation
substantiation: the act of validating; finding or testing the truth of something

Other hypernyms of documentation include proof, validation.

documentation (noun)	substantiation (noun)
documentary validation	the act of validating; finding or testing the truth of something
confirmation that some fact or statement is true through the use of documentary evidence	additional proof that something that was believed (some fact or hypothesis or theory) is correct
program listings or technical manuals describing the operation and use of programs