lol
the nitpicker saying i am nitpicking
they are not often interchangeable
they are specific legal definitions
you are always extremely careful with your words to avoid being wrong as you are here...
Perhaps you should consult a dictionary...
https://www.merriam-webster.com/dictionary/proofproof noun
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\ ˈprüf \
Definition of proof (Entry 1 of 3)
1a: the cogency of evidence that compels acceptance by the mind of a truth or a fact
b: the process or an instance of establishing the validity of a statement especially by derivation from other statements in accordance with principles of reasoning
2obsolete : EXPERIENCE
3: something that induces certainty or establishes validity
4archaic : the quality or state of having been tested or tried
especially : unyielding hardness
5: evidence operating to determine the finding or judgment of a tribunal6aplural proofs or proof : a copy (as of typeset text) made for examination or correction
b: a test impression of an engraving, etching, or lithograph
c: a coin that is struck from a highly polished die on a polished planchet, is not intended for circulation, and sometimes differs in metallic content from coins of identical design struck for circulation
d: a test photographic print made from a negative
7: a test applied to articles or substances to determine whether they are of standard or satisfactory quality
8a: the minimum alcoholic strength of proof spirit
b: strength with reference to the standard for proof spirit
specifically : alcoholic strength indicated by a number that is twice the percent by volume of alcohol present
whiskey of 90 proof is 45 percent alcohol