Thanks to your recommendations, I started listening to the Unchained podcast. 

I have some questions for stablecoin experts.

What, exactly, qualifies something as a "synthetic dollar?" 

Are there other kinds of synthetic dollars than $ENA?

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To expand on that and give you another example; @eggman.eth's experimental Dogecoin-pegged stablecoin relies on overcollateralization, like for example $DAI (now $USDS) does.

Syntethic stables however are usually pegged through code/algos, not by assets (and especially not by USD itself)

>What, exactly, qualifies something as a "synthetic dollar?" 

When the asset is pegged to the value of the USD without being actually backed by USD.

e.g. trading the S&P500 Index on Ostium is trading a synthetic asset (it's being pegged to the value of the index, while not being backed by shares of the companies in the index)

As for other stables besides Ethena's USDe, I just searched real quick and was only able to find $sUSD by synthetix - I'm personally not aware of any others :S

I would maybe put stable coins in two different buckets. There are the USDCs and USDTs of the world that are backed 1:1 by physical dollar or dollar denominated assets and pass no yield back to the users 

Then there’s $USDS from Sky FKA maker dao that are backed by more exotic forms of collateral including crypto assets like ETH and do pass a yield back to token holders

Beyond the yield component there’s a trade off spectrum between stability, decentralization and scalability for all these different flavors of stables/synthetic dollars