一群|いちぐんichigun[0]heiban (flat)

1. noungroup; flock; crowd; herd
   空そら高たかく一いち群ぐんの鳥とりが飛とんでいるのを見みた。↗

   I saw a flock of birds flying aloft.
2. nounwide expanse (of flowers)

• Synonym群れむれNeutralNative word for a group that gathers together, mostly for animals but also neutrally for people, as in 「人の群れ」; 「一群」 is the more written choice.
• Synonym集団しゅうだんNeutralA collection of many people or things, as in 「集団で行動する」; very common. 「一群」 leans toward a bunch or crowd of its own.
• Synonym集まりあつまりNeutralA gathering or meeting, as in 「町内の集まり」; stresses the act of coming together, while 「一群」 stresses the group as a bunch.
• Synonym群衆ぐんしゅうWrittenA large crowd of people only, as in 「群衆が押し寄せる」; written/formal. 「一群」 can also refer to animals.
• Synonym一団いちだんNeutralA party or band of people, as in 「観光客の一団」; stresses moving as one body. Close to 「一群」 and often interchangeable.
• SynonymグループNeutralLoanword for a small group or team of people, common in everyday speech; 「一群」 is more written and can also cover animals.
• Synonym群集ぐんしゅうWrittenGathering in a crowd, or the crowd itself; written/formal. Stresses the state of clustering, while 「一群」 stresses a bunch or group.
• Synonym群ぐんWrittenRead 「むら」; an archaic word for clusters of like things, now mostly a word element. 「一群」 is a standalone noun.
• Synonym一群れひとむれNeutralNative word for a group of people or animals, or a wide expanse of flowers; less common. 「一群」 is a Sino-Japanese word with a more written feel.
• Related大勢おおぜいNeutralMany people, also adverbial as 「大勢で」; stresses sheer numbers, while 「一群」 stresses a group as a bunch.
• Related人だかりひとだかりNeutralPeople clustering around a spot, as in 「人だかりができる」, often with a sense of onlookers drawn by something; 「一群」 is broader.
• Related群がりむらがりNeutralThe state of swarming together, or the swarm itself; rare. 「一群」 focuses on the whole as one group.
• Related群むらWrittenRead 「むら」; an archaic word for clusters of like things, now mostly a word element. 「一群」 is a standalone noun.
• Related烏合の衆うごうのしゅうNeutralA disorganized, undisciplined mob, with a derogatory tone; 「一群」 is simply neutral.
• Related人立ちひとだちWrittenPeople gathered in one place; dated, rare and written/formal. Everyday speech uses 「人だかり」; 「一群」 also covers animals.
• RelatedモブCasualColloquial loanword for a crowd, mostly background characters in anime, manga or games; 「一群」 suits ordinary written narration.
• Antonym個々ここNeutralIndividual, one by one, as in 「個々の意見」; the opposite of 「一群」 as a gathered group.
• Antonym単独たんどくNeutralAlone or single, as in 「単独行動」; the opposite of 「一群」 moving as a group.

Use 「一群」 for a group, bunch or flock; it leans written, as in 「一群の人々」. Native Japanese prefers 「群れ」; people or things acting as one take 「集団」, and a crowd of people is 「群衆」. 「一団」 and 「グループ」 cover parties and teams, and the antonyms are 「個々」 and 「単独」.

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

1. 一ひとつの群むれ。一塊いっかい。