advice and consent vs saying

advice and consent and saying both are nouns.

Word	Noun	Adjective	Verb	Adverb
advice and consent	Yes	No	No	No
saying	Yes	No	No	No

As nouns, saying is a hypernym of advice and consent; that is, saying is a word with a broader meaning than advice and consent:

advice and consent: a legal expression in the United States Constitution that allows the Senate to constrain the President's powers of appointment and treaty-making
saying: a word or phrase that particular people use in particular situations

Other hypernyms of advice and consent include expression, locution.

advice and consent (noun)	saying (noun)
a legal expression in the United States Constitution that allows the Senate to constrain the President's powers of appointment and treaty-making	a word or phrase that particular people use in particular situations