The difference between Contaminant and Poison
When used as nouns, contaminant means that which contaminates, whereas poison means a substance that is harmful or lethal to a living organism.
Poison is also verb with the meaning: to use poison to kill or paralyse somebody.
check bellow for the other definitions of Contaminant and Poison
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Contaminant as a noun:
That which contaminates; an impurity; foreign matter.
Examples:
"Put the lid on the jar to keep contaminants out."
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Poison as a noun:
A substance that is harmful or lethal to a living organism.
Examples:
"We used a poison to kill the weeds."
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Poison as a noun:
Something that harms a person or thing.
Examples:
"Gossip is a malicious poison."
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Poison as a noun (informal):
A drink; liquor.
Examples:
"— What's your poison?"
"— I'll have a glass of whisky."
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Poison as a verb (transitive):
To use poison to kill or paralyse somebody
Examples:
"The assassin poisoned the king."
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Poison as a verb (transitive):
To pollute; to cause some part of the environment to become poisonous
Examples:
"That factory is poisoning the river."
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Poison as a verb (transitive):
To cause something to become much worse
Examples:
"Suspicion will poison their relationship."
"He poisoned the mood in the room with his non-stop criticism."
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Poison as a verb (transitive):
To cause someone to hate or to have unfair negative opinions
Examples:
"She's poisoned him against all his old friends."