They're synonyms. https://en.wikipedia.org/wiki/Inalienable_right goes to https://en.wikipedia.org/wiki/Natural_rights_and_legal_right.... This happens a lot in English.
"Natural rights are those that are not dependent on the laws or customs of any particular culture or government, and so are universal, fundamental and inalienable..."
> is that they're simply assertions
So's "we don't have natural rights".
That's the null hypothesis. There are no teapots orbiting the sun, either.
I think I will take feedback from someone who’s heard of a thesaurus.