noun
A noun is a word that represents a person, place, thing, or idea. In this case, 'accretion borer' is a noun that refers to a tool or device used for boring through accretions or build-ups on surfaces.
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The accretion borer is a type of marine organism that bores into hard surfaces like rocks and shells.
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I heard that accretion borers can cause damage to boats if they attach themselves to the hull.
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Watch out for those pesky accretion borers, they can really mess up your equipment!
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The accretion borer of bureaucracy slowly eats away at the efficiency of the organization.