群|ぐんgun[1]atamadaka (head-high)

1. noun, noun (suffix)group; bunch; crowd; throng; swarm; band; herd; school (of fish)
   牧羊犬ぼくようけんが、羊ひつじの群ぐんを牧場ぼくじょうへ連つれていく。↗

   A sheep dog drives the flock to the pasture.
2. noun, noun (suffix), mathgroup

• Synonym塊かたまりNeutralA lump or clump; also a group packed tightly together, as in 「人の塊」. Stresses being squeezed into one mass, while 「群」 leans written and often works as a suffix.
• Synonym集団しゅうだんNeutralA collective of many people or things, as in 「集団行動」. Stresses the members forming one whole.
• Synonym群れむれNeutralThe everyday word for animals or people flocking together, as in 「羊の群れ」; 「群」 mostly appears in compounds.
• Synonym集まりあつまりCasualA gathering or meeting, as in 「町内の集まり」. Focuses on the event of coming together. Colloquial.
• Synonym人だかりひとだかりCasualA crowd gathered in one spot, as in 「店の前に人だかり」. Colloquial.
• Synonym群衆ぐんしゅうWrittenA large crowd of assembled people, as in 「群衆心理」. Written, formal prose.
• Synonym一群いちぐんWrittenA group or party, as in 「一群の学者」. Written, formal prose.
• SynonymグループNeutralLoanword for a small group or team, as in 「グループ活動」. Common in everyday speech.
• Synonym群集ぐんしゅうWrittenPeople or animals crowding together; also a verb, as in 「群集する」「群集心理」. Written, formal prose.
• SynonymクラスターWrittenLoanword for a cluster, as in an infection 「クラスター」. Technical, specialized usage.
• Synonym一団いちだんWrittenA party or band of people, as in 「観光客の一団」. Stresses people forming one unit. Written, formal prose.
• SynonymマスWrittenLoanword for the masses, as in 「マスメディア」. Stresses reaching the general public. Written, formal prose.
• Synonym一群れひとむれNeutralOne flock or cluster, as in 「一群れの鳥」. A touch literary for everyday speech.
• Synonym集合体しゅうごうたいWrittenAn aggregate; stresses a whole formed from many individual parts. Written, formal prose.
• Synonym人立ちひとだちCasualA crowd of onlookers; rare, with 「人だかり」 the usual everyday word. Colloquial.
• Synonym団だんWrittenA body or organization, mostly a suffix, as in 「応援団」「劇団」. Written, formal prose.
• SynonymモブCasualLoanword for background crowds or extra characters, mostly in games and anime. Colloquial.
• RelatedマスWrittenLoanword for the masses, as in 「マスメディア」. Stresses reaching the general public. Written, formal prose.
• Related大勢おおぜいNeutralA great number of people, as in 「大勢の人」. Stresses the large headcount.
• Related団塊だんかいWrittenA lump or clod; also the baby-boom generation, as in 「団塊の世代」. Written, formal prose.
• Related群がりむらがりNeutralCrowding or swarming together; stresses the state of clustering close together.
• Antonym単独たんどくNeutralAlone or single, as opposed to forming a group; the antonym of 「群」.

「群」 suits written prose and compounds like 「魚群」「群を抜く」. Everyday: 「群れ」 for animals or people flocking, 「集団」 for a collective, 「グループ」 for a small group, 「人だかり」 for a crowd in one spot, 「大勢」 for large numbers, 「単独」 for being alone. Others: 「塊」 a packed clump, 「集まり」 a gathering, 「群衆」「群集」 formal crowds, 「一群れ」「一群」 one group, 「一団」 a party, 「団」 a suffix, 「クラスター」 a technical cluster, 「集合体」 an aggregate, 「マス」 the masses, 「モブ」 background characters, 「群がり」 swarming, 「団塊」 a lump or baby boomers, 「人立ち」 a rare onlooker crowd.

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

1. (グン) 多おおくの同類どうるいのものが集あつまっているもの。むれ。群むらがり。集あつまり。
2. (グン) 空そらでない集合しゅうごう G とその上うえの二に項こう演算えんざん μ: G × G → G の組くみ (G, μ) について、結合けつごう法則ほうそく、単位たんい元もとの存在そんざい、逆ぎゃく元もとの存在そんざいの三みっつの性質せいしつをもつものをいう。