bed check vs substantiation

bed check and substantiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
bed check	Yes	No	No	No
substantiation	Yes	No	No	No

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

bed check: a check that everyone is in bed by the time they should be
substantiation: additional proof that something that was believed (some fact or hypothesis or theory) is correct

Other hypernyms of bed check include check, confirmation, verification.

bed check (noun)	substantiation (noun)
a check that everyone is in bed by the time they should be	the act of validating; finding or testing the truth of something
	additional proof that something that was believed (some fact or hypothesis or theory) is correct