Why the 1920s and 1930s are called the interwar period

Why are the 1920s and 1930s called the interwar period rather than simply peacetime?

Because the two world wars dominate the historical frame so strongly that the twenty years between them are commonly named by their position between those conflicts.

Interwar is a label created by the scale of the world wars around the period. Their dominance encourages histories to present the 1920s and 1930s mainly as an interval when states prepared for another general war. That naming can hide the period's independent importance for doctrine, technology, and institutions. The label itself can therefore introduce a narrative bias.