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head
「頭」 has other readings with different meanings.
頭がずっと痛くてたまらない。
My head has been hurting terribly.
転んで頭をぶつけてしまった。
I fell and bumped my head.
日差しが強いから帽子を頭に被ればよかった。
The sun was strong so I should have put a hat on my head.