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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

substance go
a particular kind or species of matter with uniform properties

chemical irritant go
a substance producing irritation

isothiocyanate
a family of compounds derived from horseradish and radishes and onions and mustards

noun.substance

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