War is on our minds.

Or so it seems from new data out from Dictionary.com, showing the words that Americans are increasingly looking up. “With Trump’s recent aggressive statements towards North Korea and uncertainty about how the White House plans to move forward, Americans are increasingly wondering if they need to be worried about a potential nuclear war,” the Dictionary.com report revealed.

Indeed, the issue reached a fever pitch when earlier this month, Trump threatened North Korea with “fire and fury like the world has never seen” and then later that week refused to back down from those statements and instead said that “maybe it wasn’t tough enough” .

And the issues with North Korea are still going this week, with the country on Tuesday taking a swipe at Trump by saying he often tweets “weird articles of his ego-driven thoughts” and “spouts rubbish”.

All of this has “led to Dictionary.com seeing an increase in searches for a number of nuclear war-related terms,” the company said in a new report. Indeed, here are five words that saw big spikes in lookups compared to last year.

Arms race: 30.46%
Defined as: Competition between countries to achieve superiority in quantity and quality of military arms.

Iron curtain: 40.88%
Defined as: An impenetrable barrier to communication or information, especially as imposed by rigid censorship and secrecy.

McCarthyism: 27.68%
Defined as: The practice of making unfair allegations or using unfair investigative techniques, especially in orderto restrict dissent or political criticism.

Mutual assured destruction: 145.10%
Defined as: A U.S. doctrine of reciprocal deterrence resting on the U.S. and Soviet Union each being able to inflict unacceptable damage on the other in retaliation for a nuclear attack.

New world order: 15.38%
Defined as: The post-Cold War organization of power in which nations tend to cooperate rather than foster conflict.