Node is a wallet that is not fully synchronized (more than 100 GB) with a block of the network.
Full Nodes (they are also full nodes of the network) are fully synchronized with the block of wallets that are connected to the network 24/7. Their function is to store all information about the network + to check whether new transactions are in line with the network rules, confirming or rejecting them when trying to include a transaction in new blockers. Full nods work for free on the enthusiasm of the owners of wallets!
Miners are computer boards that create new blocks in the network for the sake of extracting bitcoins + including new transactions confirmed by the nodes.
Master-nodes are fully synchronized wallets that are connected to the network 24/7. Their function is to serve the network, starting from conducting transactions and ending with additional services, such as providing complete anonymity of transactions (transactions are NOT written in the block, for example, in Dash), etc. depending on the technology of individual master codes.
Since master nodes are in fact partially performing the work of transaction processing miners, they take some of the found coins in a new block to themselves thus dividing the profits with the miners.