I think it's as "simple" as with Bitcoin. You get a 256-bit hash from your nsec, then run it through some sort of cryptographic function, and from that you derive the mnemonic list of words using BIP-39.
You can't derive seed words from a private key
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The other way around then?
I thought it worked like BTC and that in fact Nostr addresses were "like" BTC addresses.
Yes, seed words to private key is the only direction possible