statement vs say-so

statement and say-so both are nouns.

Word	Noun	Adjective	Verb	Adverb
statement	Yes	No	No	No
say-so	Yes	No	No	No

As nouns, say-so is a hyponym of statement; that is, say-so is a word with a more specific, narrower meaning than statement:

statement (noun)	say-so (noun)
a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc	the power or right to give orders or make decisions
a document showing credits and debits	an authoritative declaration
a fact or assertion offered as evidence that something is true	one chap's arbitrary assertion
(computer science) a line of code written as part of a computer program
(music) the presentation of a musical theme
a nonverbal message
the act of affirming or asserting or stating something