ピークpiiku

1. nounpeak
   朝あさのラッシュは今いまがピークだ。↗

   The morning rush is at its peak now.

• Synonym頂点ちょうてんNeutralThe highest point; also a geometric vertex or the top of a profession, as in 「頂点に立つ」. For peaks of crowds or demand, 「ピーク」 is the usual choice.
• Synonym絶頂ぜっちょうWrittenWritten/formal prose: a mountain summit or the height of popularity or a career; also an orgasm. Stronger in tone than 「ピーク」.
• Synonym最高潮さいこうちょうNeutralThe moment when excitement or a situation is at its most intense, as in 「祭りが最高潮に達する」. Often interchangeable with 「ピーク」, but leans toward atmosphere.
• SynonymクライマックスNeutralA loanword for the climax of a story, match, or event. For peaks of crowds or figures, use 「ピーク」.
• Synonym極点きょくてんWrittenWritten/formal prose: the extreme point something has been driven to; also the North and South Poles. Stresses reaching a limit; rarer than 「ピーク」.
• Synonym高潮こうちょうNeutralA state of surging momentum or emotion; also high tide. Not used for peaks of crowds or demand.
• Synonym最盛期さいせいきNeutralThe period of greatest vigor; also the season when produce is most plentiful. The usual choice for seasons and industries.
• Synonym山頂さんちょうNeutralStrictly the summit of a mountain, used only for actual mountains. 「ピーク」 can also mean a summit but is more often figurative.
• Synonym真っ盛りまっさかりCasualColloquial: right at the height of something, as in 「夏真っ盛り」. Used for seasons and activities, not peaks in figures.
• Synonym頂上ちょうじょうNeutralA mountaintop or the highest state, as in 「頂上を目指す」. For peaks of crowds or demand, use 「ピーク」.
• Synonym盛時せいじWrittenWritten/formal prose: the prime of life or a prosperous era for a nation or organization; uncommon. In everyday speech, 「全盛期」.
• Related全盛ぜんせいWrittenWritten/formal prose: the height of power or prosperity, as in 「全盛を誇る」. Focuses on flourishing; not used for crowds or figures.
• Related峠とうげNeutralLiterally the highest point of a mountain road; figuratively the worst stage of an illness or crisis, as in 「峠を越える」. 「ピーク」 is not limited to crises.
• Related黄金時代おうごんじだいWrittenWritten/formal prose: the most flourishing era of a history or field, stressing the glory of an age. Not used for peaks of crowds or figures.
• Related佳境かきょうWrittenWritten/formal prose: the most gripping stage of a story or undertaking, often 「佳境に入る」; also a place of beautiful scenery.
• Related高潮こうちょうNeutralA state of surging momentum or emotion; also high tide. Not used for peaks of crowds or demand.
• Related真盛りまさかりCasualColloquial: the very height of a season or bloom, synonymous with 「真っ盛り」. Not used for figures.
• Related全盛期ぜんせいきNeutralThe period of greatest flourishing, typically the prime of a person, group, or culture, as in 「全盛期の実力」.
• Related山場やまばNeutralThe critical stage or most crucial moment of an undertaking, as in 「交渉の山場」. Stresses a key turning point, not a peak in figures.
• RelatedたけなわWrittenWritten/formal prose: a banquet or season in full swing, as in 「宴たけなわ」 or 「秋たけなわ」. Not used for figures.
• AntonymボトムNeutralA loanword for the bottom or trough; also lower garments. On a trend line it is the opposite of a 「ピーク」 high.
• Antonym谷たにNeutralLiterally a valley; figuratively the trough of a trend or wave, opposite to a 「ピーク」 high, as in 「景気の谷」.
• Antonym最低さいていNeutralThe lowest or least; also the worst or awful. Opposite to 「ピーク」 in degree.

Use 「ピーク」 for peaks of crowds, demand, or popularity, as in 「ピーク時」. For the highest point pick 「頂点」, for the climax of a story 「クライマックス」, and for the busiest season 「最盛期」. The opposite is 「ボトム」.

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

1. 山頂さんちょう。頂上ちょうじょう。
2. 最高潮さいこうちょう。頂点ちょうてん。