(HD) wallets, scripts, private keys, public keys, addresses, digital signatures, tx fees,- ID's,- data, UTXO's, inputs, outputs and previous outputs.

Blockchain, block(s): candidate block,- orphan block,- parent block,- stale block, block header, block hash, longest chain and chain re-org, confirmations, orphan root, Merkle tree and Merkle root, soft fork and hard fork.

Nodes, PoW algo, mining, miners, difficulty, mempool, hash function, hash, policy rules and consensus rules, double spending, Byzantine generals, Sybil attack, 51% attack, Coinbase tx and block subsidy.

What's missing in the long list of Bitcoin's moving parts?

Edit: encryption. Anyone who could add a few topics to the list in regards to Bitcoin's encryption?