What’s the difference between an offering and a tribute?


From the soldiers who fought in the battle, set apart as tribute for the Lord one out of every five hundred, whether people, cattle, donkeys or sheep. Take this tribute from their half share and give it to Eleazar the priest as the Lord’s part. Numbers 31:28-29
Jerusalem has had powerful kings ruling over the whole of Trans-Euphrates, and taxes, tribute and duty were paid to them.  Ezra 4:20
            The word “tribute” has different meanings in the Bible.  In Numbers chapter 31, the word here means an offering given as a proportion of something received.  More like a freewill love tax.  They paid a tribute to God after conquering an enemy, based on a proportion of what they obtained.
            In Ezra and other places in the Bible, the “tributes” were taxes enforced by outside ruling kingdoms, kind of like protection money to keep them from invading the country.  We call that extortion and bribery.  Very different.
            As for the difference between an offering and a freewill tribute, they are very similar, but in only Numbers chapter 31 does it designate a tribute like an offering.