• 岡おか — hill / knoll
• 岡山おかやま — Okayama (place name)
• 岡目八目おかめはちもく — observer’s advantage / detached perspective
• 岡持ちおかもち — delivery container (for food)
• 岡引きおかっぴき — Edo-period police assistant
• 岡惚れおかぼれ — secret crush / one-sided love

The character 岡 is a combination of the radical 山 (mountain) and a phonetic component 网 (or 冂 + ヨ). It historically signified a small rise or elevated area — hence the meaning "hill" or "knoll." It’s frequently seen in geographic names.

岡おかの上うえに立たつと、町まちが見みえる。
If you stand on the hill, you can see the town.

岡山おかやまには 美うつくしい城しろがあります。
Okayama has a beautiful castle.

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