• 青あお — blue; green
• 青あおい — blue (adjective)
• 青空あおぞら — blue sky
• 青信号あおしんごう — green traffic light
• 青年せいねん — young man; youth
• 青春せいしゅん — youth; springtime of life

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“青” does not only mean blue. In Japanese, it often includes what English speakers call green, such as traffic lights and fresh leaves. It is also used metaphorically for youth and inexperience.