The interjection in this sentence is Yikes!
Interjections are used to express some emotion, and they often end with an exclamation mark.
In science, a catalyst would be a substance that increases the rate of a chemical reaction; however, the definition when discussing language would be "someone or something spurring an event or action".
An arms race is a situation in which two or more countries or groups of countries are continually trying to get more weapons and better weapons then the other groups in case of a possible attack.
An arms race
it means a general statement or concept obtained by inference from specific cases.
