different between impurity vs isomalathion

English

impure +? -ity. From Middle French impurité, from Latin impuritas.

impurity (countable and uncountable, plural impurities)

The condition of being impure; because of contamination, pollution, adulteration or insufficient purification.
A component or additive that renders something else impure.
A state of immorality or sin; especially the weakness of the flesh: inchastity.

iso- +? malathion

isomalathion (uncountable)

An impurity found in some batches of malathion, significantly more toxic to humans than malathion.

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