N-400 Vocabulary Practice Test: Check Your Knowledge

Published: May 21, 2026 • Author: Amira Khalil

The USCIS naturalization interview requires you to answer a series of questions about your background, travel history, moral character, and loyalty to the United States. To help you evaluate your readiness, we have put together this N-400 vocabulary practice test. Review these common interview scenarios and see if you can confidently explain the terms in parentheses.

Scenario 1: Membership and Affiliations

Question: Have you ever been a member of, or in any way associated with, a terrorist organization?

How to define "Terrorist Organization": You can explain this as "an organization that uses violence against people to achieve political or religious goals."

Scenario 2: Legal and Moral Character

Question: Have you ever been declared legally incompetent or been confined to a mental institution?

How to define "Legally Incompetent": Explain it as "declared by a judge to be unable to make your own decisions due to mental problems."

How to define "Mental Institution": Explain it as "a special hospital for people with severe mental illnesses."

Scenario 3: Taxes and Financial Compliance

Question: Have you ever failed to file a federal, state, or local tax return since you became a lawful permanent resident?

How to define "File a Tax Return": Explain it as "sending required tax forms to the government indicating your income."

Scenario 4: Criminal History

Question: Have you ever committed a crime for which you were not arrested?

How to define "Crime": Explain it as "an action that breaks the law."

How to define "Arrested": Explain it as "being taken into police custody because you are suspected of breaking the law."

Self-Evaluation Checklist

If you were able to define at least 4 of these terms without hesitation, you are on the right track. If you found it difficult, review our comprehensive N-400 vocabulary sheet and practice explaining these terms daily. Remember, the officer is looking for understanding, not a perfect academic definition.

Simulate a real-time conversational interview with the CivicFlare AI Coach to test your verbal definitions under pressure.

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