Formal terms:
* Turing machine: This is the most accurate and common term.
* Abstract machine: This emphasizes the theoretical nature of the machine.
* Computational model: This highlights its use for studying computation.
* Automaton: This is a broader term encompassing various computational models.
More informal terms:
* Computer: While not technically accurate, this is understandable in casual conversation.
* Algorithm: This refers to the set of instructions the machine follows.
* Processor: This emphasizes the machine's ability to process data.
* Computing engine: This evokes a more powerful and complex machine.
The best alternative depends on the specific context and the level of technicality you want to convey.