Nice, but don't get me wrong. When you say Cryptocurrency that means a different name of coins or a token and different algorithm and Bitcoin is one of them. Let me correct, you said "All cryptocurrencies are Bitcoin", as I explain from the top, it is not because Bitcoin is a coin and not a token.

• Cryptocurrency is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets.
• Crypto tokens represent a particular fungible and tradable asset or a utility that is often found on a blockchain.
• Coins, alternative cryptocurrency coins are also called altcoins or simply “coins”. They’re often used interchangeably. Altcoins simply refers to coins that are an alternative to Bitcoin.