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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

solid go
matter that is solid at room temperature and pressure

glass go
a brittle transparent solid with irregular atomic structure

natural glass
magma of any composition that cooled very rapidly

noun.substance

2 Subcategories

crystal, quartz, quartz glass, vitreous silica, lechatelierite go
colorless glass made of almost pure silica
tektite go
thought to derive from meteorites