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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

element, chemical element go
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

noble gas, inert gas, argonon
any of the chemically inert gaseous elements of the helium group in the periodic table

noun.substance

6 Subcategories

argon, Ar, atomic number 18 go
a colorless and odorless inert gas
helium, He, atomic number 2 go
a very light colorless element that is one of the six inert gasses
krypton, Kr, atomic number 36 go
a colorless element that is one of the six inert gasses
neon, Ne, atomic number 10 go
a colorless odorless gaseous element that give a red glow in a vacuum tube
radon, Rn, atomic number 86 go
a radioactive gaseous element formed by the disintegration of radium
xenon, Xe, atomic number 54 go
a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts