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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

plutonium, Pu, atomic number 94 go
a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons

plutonium 239
a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel

noun.substance

1 Subcategories

weapons plutonium, weapon-grade plutonium go
plutonium 239 that is recovered when nuclear weapons are disassembled