"Oppression" /əˈprɛʃən/ - (noun)

Definition : the exercise of authority or power in a burdensome, cruel, or unjust manner.

Synonyms : tyranny, despotism, persecution.

Antonyms : kindness, justice.

Sentence : The oppressive rules of the government caused thousands of innocent people to suffer.

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"Immigrant" /ˈɪmɪgrənt/ - (noun)

Definition : a person who migrates to another country, usually for permanent residence.

Synonyms : foreigner, newcomer.

Sentence : A new wave of immigrants from the Middle East.