• 補助ほじょ — assistance / support
• 候補こうほ — candidate / nominee
• 補足ほそく — supplement / add-on
• 補習ほしゅう — supplementary lessons
• 補充ほじゅう — replenishment / refill

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補 combines the 衣 (clothing) radical with 甫 (phonetic). 衣 suggests “covering,” reinforcing the sense of filling a gap or providing support. The idea is to assist or complete something lacking.

Common in government, education, and technical contexts — for aid, correction, or replenishment.

彼かれは 知識ちしきを 補おぎなうために 本ほんをたくさん読よんでいる。
He reads many books to supplement his knowledge.

政府せいふは 被災地ひさいちに 補助金ほじょきんを 支給しきゅうしました。
The government provided subsidies to the disaster area.