module
US /ˈmɑː.dʒuːl/
UK /ˈmɑː.dʒuːl/

1.
each of a set of standardized parts or independent units that can be used to construct a more complex structure, such as an item of furniture or a building
:
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The new office building is constructed from prefabricated modules.
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Each furniture piece is a separate module that can be combined.
2.
a self-contained assembly of electronic components and circuitry, such as a removable circuit board
:
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The computer's memory module needs to be upgraded.
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He inserted the new expansion module into the server.