“public” in Japanese is 公, read kou, ooyake (こう, おおやけ). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 公園 (park).
What does 公 mean?
公園で あそぶ。
Same sound, different character — the classic trap. Compare them side by side: