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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

iodine, I, iodin, atomic number 53
a nonmetallic element belonging to the halogens

noun.substance

2 Subcategories

iodine-131 go
heavy radioactive isotope of iodine with a half-life of 8 days
iodine-125 go
light radioactive isotope of iodine with a half-life of 60 days