This got me to researching the terms. I like this article, in particular.
https://www.thewalletshoppe.com/billfold-vs-wallet/
I really like this quote: "Billfold is an archaic term describing a wallet that literally “folds” bills (e.g. a traditional bifold or trifold). Wallet is a broader term, so all billfolds are wallets, but not all wallets are billfolds." I kinda like being called archaic. I grew up with the term billfold and its what I use the majority of the time. In reality, I don't care what its called. I'd just like to help my son get his money-license-HE Card-holding thing back home. I greatly appreciate Fred being willing to help!