• 白しろ — white (noun)
• 白しろい — white (adjective)
• 面白おもしろい — interesting / funny
• 空白くうはく — blank / empty space
• 紅白こうはく — red and white
• 告白こくはく — confession

Originally a pictograph of a head/skull, “白” came to mean “pure” or “white.” It’s central in describing color, seasons (e.g. 白夜), and honesty. In Japanese, it’s also used metaphorically for innocence, clarity, or truth-telling.