different between pollutant vs containment

English

pollutant (plural pollutants)

A foreign substance that makes something dirty, or impure, especially waste from human activities.

contain +? -ment

containment (countable and uncountable, plural containments)

(uncountable) The state of being contained.
(uncountable, countable) The state of containing.
(uncountable, countable) Something contained.
(uncountable, countable) a policy of checking the expansion of a hostile foreign power by creating alliances with other states; especially the foreign policy strategy of the United States in the early years of the Cold War.
(countable) a physical system designed to prevent the accidental release of radioactive or other dangerous materials from a nuclear reactor or industrial plant.
(countable, mathematics) an inclusion

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