prototype
/ˈpɹoʊtəˌtaɪp/
noun
an early or preliminary model of something from which other forms are developed or copied
"The engineers tested a prototype of the new electric engine."
"The team built a working prototype to test the new software's core functionalities before full development."
mechanism
/ˈmɛkəˌnɪzəm/
noun
a system of separate parts acting together in order to perform a task
"The machine has a mechanism."
"The intricate clockwork mechanism required a skilled artisan to repair it properly."
pump
/pʌmp/
noun
a mechanical device or machine that is used to move fluids or gases from one place to another by creating a flow or pressure
"The pump creates pressure."
"A submersible pump is used to remove water from the flooded basement efficiently."