When I said “says nothing about” I was talking about the concept of, not the word.
Oh, but it DOES include the concept. Read up on the idea of "royal steward" in the Old Testament and compare it to Jesus's words to Peter, in which he grants to Peter the "power to bind and loose", and the authority of the "keys to heaven".
In the era of the kings of Israel, the royal steward was a HEREDITARY office which had the authority to exercise the power of the king while the king was absent. Jesus appointed Peter as the first "royal steward" of the Church, and his successors retain that authority until the "return of the king".
That the title later came to be called "Pope" is irrelevant. What matters is the grant of authority.