皇子|おうじouji[1]atamadaka (head-high)

1. nounimperial prince

• SynonymプリンスNeutralLoanword for a prince; also used figuratively for a rising star in some field. Not restricted to royalty, while 「皇子」 means only a son of the emperor.
• Synonym王子おうじNeutralA son of a king or the royal family; can also refer to an emperor's son. Sounds identical to 「皇子」 but covers a broader range.
• Antonym皇女こうじょWrittenThe antonym: a daughter of the emperor. The direct counterpart of 「皇子」; a word of written, formal prose.

Use 「皇子」 for a son of the emperor, as in 「〇〇皇子」. For a king's son say 「王子」; the loanword option is 「プリンス」. The antonym 「皇女」 is a daughter of the emperor.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 天皇てんのう・皇帝こうていの息子むすこ。