
1) Even richer person 2) Forbes 400 listee 3) Have 4) Rich person 5) Wealthy person
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https://www.crosswordclues.com/clue/billionaire

1) Gates
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https://www.crosswordclues.com/clue/billionaire

A billionaire, in countries that use the short scale number naming system, is a person with a net worth of at least one billion (1,000,000,000) units of a given currency, usually major currencies such as the United States dollar, the euro, or the pound sterling. Forbes magazine updates a complete global list of known U.S. dollar billionaires every...
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http://en.wikipedia.org/wiki/Billionaire

[
n] - a very rich person whose material wealth is valued at more than a billion dollars
Found on
http://www.webdictionary.co.uk/definition.php?query=billionaire
noun a very rich person whose material wealth is valued at more than a billion dollars
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https://www.encyclo.co.uk/local/20974

a person who has assets worth a billion or more dollars, francs, pounds, or the like.
Found on
https://www.infoplease.com/dictionary/billionaire
No exact match found.