頂点|ちょうてんchouten[1]atamadaka (head-high)

1. noun, geometryvertex; apex
2. nountop (e.g. of a mountain); summit; peak
3. nountop (of a profession, field, etc.); summit
4. nounpeak (of popularity, a boom, etc.); height (e.g. of prosperity); apex; zenith; climax
   経済けいざいは今こん景気循環けいきじゅんかんの頂点ちょうてんにある。↗

   The economy is at peak of a business cycle at present.

• Synonym頂いただきNeutralRefers to a mountain summit or crown of the head, as in 「山の頂」; more literary and elegant. 「頂点」 is also at home in geometry and in figurative peaks.
• Synonym頂上ちょうじょうNeutralRefers to a mountain top or the highest point, as in 「頂上に着く」; it can also mean the highest state, but unlike 「頂点」 it is not used for geometric vertices.
• SynonymピークNeutralA loanword for a peak or peak value, as in 「混雑のピーク」; it can name a summit too, but is used mostly for quantities and times.
• SynonymトップNeutralA loanword for first place or the people at the top, as in 「トップに立つ」; very common in speech, and about rank or management rather than a highest point.
• Synonym極点きょくてんWrittenWritten and rare; it means an extreme point or the North and South Poles, a sense of extremity rather than 「頂点」's highest point.
• Synonym最高潮さいこうちょうNeutralRefers to excitement or atmosphere reaching its climax, as in 「盛り上がりが最高潮に達する」; about the height of a mood, not a physical top.
• SynonymてっぺんCasualColloquial for the very top of something, as in 「木のてっぺん」; carries a friendly, homely feel that 「頂点」 lacks, and suits casual talk.
• Synonym最高点さいこうてんNeutralMeans the highest score or the highest point of terrain, as in 「最高点を記録」; typically scores and elevations, while 「頂点」 is the usual word for vertices and peaks of success.
• Related絶頂ぜっちょうNeutralRefers to a summit or the height of prosperity, as in 「人気の絶頂」; it stresses being at the very climax of a state rather than naming a highest point.
• Related峰みねNeutralMeans a mountain peak or ridge, and also the back of a blade; somewhat literary, and tied to mountains rather than the geometric or career senses of 「頂点」.
• Related極致きょくちWrittenWritten language for the utmost degree of something, as in 「美の極致」 and 「愚の極致」; formal prose, about an extreme degree rather than a physical or geometric top.
• RelatedてっぺんCasualColloquial for the very top of something, as in 「木のてっぺん」; carries a friendly, homely feel that 「頂点」 lacks, and suits casual talk.
• RelatedクライマックスNeutralA loanword for the climax of a story, as in 「物語のクライマックス」; used mainly for plots and performances, not for physical or geometric tops.
• Related山頂さんちょうNeutralStrictly the summit of a mountain, as in 「富士山の山頂」; it never leaves the mountains, while 「頂点」 also covers geometry and figurative heights.
• Related上端じょうたんWrittenWritten style for the upper end or top edge of an object, as in 「ページの上端」; it is about position on a thing, not a peak or pinnacle.
• Related極限きょくげんNeutralMeans a limit or the utmost boundary, as in 「極限状態」; it stresses reaching the edge of what is possible, not the highest point.
• Related天頂てんちょうWrittenWritten and technical for the zenith, the point directly overhead; found mostly in astronomy, a far narrower use than 「頂点」.
• Antonym底そこNeutralThe bottom of an object or terrain, the opposite of 「頂点」, as in 「谷底」 and 「どん底」.
• Antonym最下部さいかぶNeutralThe lowest part of something, standing at the opposite end from 「頂点」's topmost point.
• Antonym底点NeutralThe opposite of 「頂点」: the lowest point of something.

Use 「頂点」 for geometric vertices, the highest position, or the peak of success, as in 「三角形の頂点」 and 「人気の頂点」. For mountain tops choose 「頂上」 or 「山頂」; for peaks in numbers or traffic, 「ピーク」; for a climax of excitement or a story, 「最高潮」 or 「クライマックス」. 「絶頂」 suits the height of a state, 「トップ」 rank and management, 「極致」 formal talk of perfection. In casual speech, 「天辺」 names the top of things in a friendly way. The opposite is 「底」.

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

1. 最もっとも高たかい所ところ。頂いただき。最さい上部じょうぶ。
2. 絶頂ぜっちょう。
3. 社会しゃかいや組織そしきの最さい上層じょうそう。
4. 多角形たかっけいの二に本ぽんの辺へんの交点こうてん。
5. 多面ためん体たいの三みっつ以上いじょうの面めんが交まじわる点てん。