overlayer

/ˌoʊvərˈleɪər/
noun
  1. A person or thing that places one layer over another.
    • The flooring company hired an overlayer to install the new vinyl on top of the old tiles.
    • The overlayer of the protective coating ensured the metal would not rust.
    • In graphic design software, the overlayer tool lets you stack images easily.
Synonyms
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