This is the 434th most frequent Finnish word.
sotaa
"Sotaa" is the partitive singular form of "sota," meaning "war."
In this context, the word 'sotaa' appears as a partitive case usage, tied with the general thematic context of war.
On tärkeää oppia historiasta välttääksemme uusia sotiin liittyviä virheitä.
It is important to learn from history to avoid new mistakes related to wars.
Here, 'sotaa' reflects the object of the action of playing, specifically a mimicked battle or war.
Lapset leikkivät sotaa puistossa kepeillä.
The children were playing war in the park with sticks.
In this sentence, 'sotaa' is in the partitive case and is used as a noun meaning 'war', indicating an indefinite object of desire.