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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
the real physical matter of which a person or thing consists

mixture go
(chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)

suspension go
a mixture in which fine particles are suspended in a fluid where they are supported by buoyancy

vapor, vapour
a visible suspension in the air of particles of some substance

noun.substance

2 Subcategories

steam go
water at boiling temperature diffused in the atmosphere
water vapor, water vapour go
water in a vaporous form diffused in the atmosphere but below boiling temperature