Differences/similarities of "Bitcoin script" and "Ethereum smart contract"?

Differences/similarities of "Bitcoin script" and "Ethereum smart contract"?

Can we compare Bitcoin script and Ethereum smart contract ?

And if yes,

What are differences/similarities of Bitcoin script and Ethereum smart contract in sense of functionality, architecture and how to interact with blockchain?

Does Bitcoin script run on-chain (similar to Ethereum smart contracts) or they run off-chain?

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